Re: [MBZ] Brakes, again (300SD)
> Rich Thomas wrote: > I'm thinking I should put some teflon tape on the bleeders to > seal up those threads a bit and keep the air from getting in > my bleed tube (using a Mityvac), I use grease. That also help keep the threads lubed so it turns next time I need it to. -- Philip ___ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] Brakes, again (300SD)
I would make sure the reservoir is completely full and bleed again -- the back chamber is filled by overflowing the front one, and it's quite easy to have it go dry. A MityVac works great, so long as you remember that you are going to pull air in the bleeder valves and won't ever get air free fluid. Once you get clean fluid out and there are no big air bubbles, it's full and free of air, you can ignore the stream if tiny bubbles leaking in the threads. Big slugs of air, you have a leak or the reservoir is going empty on you. I've chased that particular problem for ages once or twice. The pedal, with the engine running, should have about an inch of free play, become firm quickly, and stay firm, with added pressure resulting in more braking effect with very little movement downward. A sinking pedal under light pressure, mysterious loss of fluid, no brakes unless you pump them, and excessive travel with less than normal braking power all indicate a bad master cylinder, usually from worn out seals on the back piston. Check to make sure the rear pads are clean and move easily -- they get stuck much more readily than the fronts, and can give you goofy brakes, too. Lack of wear on the rear rotors is a hint here. Peter On Oct 22, 2010, at 7:25 AM, Dillon, Meade M CIV SPAWARSYSCEN- ATLANTIC, 53310 wrote: Rich, I suspect your bleeding method isn't working too well. I have the "Power Bleeder" which pressurizes the reservoir, if you'd like to borrow it. You'll need to make sure the two rubber sensor caps on top of the reservoir are in good shape prior to pressurizing. The "old school" way of two people working together, one pressuring via pumping the brake pedal and the holding with the second opens/ closes the bleed valve to allow fluid/air to escape works well but you risk destroying the seals in the master cylinder if fluid changes have been neglected and there is gunk beyond the normal range of travel that the seals hit when the pedal sinks to the floor. I used to use the gravity drain method, and just attach hose from bleeder to a drain bottle or can and let physics pull the fluid out. Slow, but safe and effective. Now I can do the job with MORE POWER! -Max -Original Message- From: mercedes-boun...@okiebenz.com [mailto:mercedes- boun...@okiebenz.com] On Behalf Of Rich Thomas Sent: Friday, October 22, 2010 7:40 AM To: Mercedes Discussion List Subject: Re: [MBZ] Brakes, again (300SD) Yes, all 4 in the proper sequence, twice. I'm thinking I should put some teflon tape on the bleeders to seal up those threads a bit and keep the air from getting in my bleed tube (using a Mityvac), though I don't think it is going back into the calipers. At first they were a bit mushy after I put on the new caliper and filled it and bled it a bit, so I went around the car again and then it was better, pretty much as it was before I started the exercise. I'll take a look at the bushing, but the pedal does not seem to have play in it, just takes some travel to start brake engagement. I guess they aren't "touchy!" --R On 10/22/2010 7:21 AM, Rolf wrote: Check the bushing on the brake pedal where it meets the rod that goes into the booster. If this is missing or deteriorated then you get more travel before braking. Otherwise is sounds like you need to bleed more. Did you bleed all 4? -Rolf On 10/22/2010 7:14 AM, Rich Thomas wrote: So I got the new caliper on and hooked up, and system bled as best I could (there seems to be a lot of air leakage around the bleed nipples) with new fluid. The pedal feel is not a lot different from before, still seems to have about an inch of travel before getting much braking, and seems a bit soft though the brakes work OK. Might this be a master cylinder issue, or is that just the way they are? --R ___ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com ___ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com ___ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com -- next part -- A non-text attachment was scrubbed... Name: smime.p7s Type: application/x-pkcs7-signature Size: 5688 bytes Desc: not available URL: <http://oki
Re: [MBZ] Brakes, again (300SD)
Dillon, Meade M CIV SPAWARSYSCEN-ATLANTIC, 53310 wrote: Rich, I suspect your bleeding method isn't working too well. I have the "Power Bleeder" which pressurizes the reservoir, if you'd like to borrow it. You'll need to make sure the two rubber sensor caps on top of the reservoir are in good shape prior to pressurizing. If he has ABS, that might be more necessary than optional. Mitch. ___ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] Brakes, again (300SD)
Rich, I suspect your bleeding method isn't working too well. I have the "Power Bleeder" which pressurizes the reservoir, if you'd like to borrow it. You'll need to make sure the two rubber sensor caps on top of the reservoir are in good shape prior to pressurizing. The "old school" way of two people working together, one pressuring via pumping the brake pedal and the holding with the second opens/closes the bleed valve to allow fluid/air to escape works well but you risk destroying the seals in the master cylinder if fluid changes have been neglected and there is gunk beyond the normal range of travel that the seals hit when the pedal sinks to the floor. I used to use the gravity drain method, and just attach hose from bleeder to a drain bottle or can and let physics pull the fluid out. Slow, but safe and effective. Now I can do the job with MORE POWER! -Max -Original Message- From: mercedes-boun...@okiebenz.com [mailto:mercedes-boun...@okiebenz.com] On Behalf Of Rich Thomas Sent: Friday, October 22, 2010 7:40 AM To: Mercedes Discussion List Subject: Re: [MBZ] Brakes, again (300SD) Yes, all 4 in the proper sequence, twice. I'm thinking I should put some teflon tape on the bleeders to seal up those threads a bit and keep the air from getting in my bleed tube (using a Mityvac), though I don't think it is going back into the calipers. At first they were a bit mushy after I put on the new caliper and filled it and bled it a bit, so I went around the car again and then it was better, pretty much as it was before I started the exercise. I'll take a look at the bushing, but the pedal does not seem to have play in it, just takes some travel to start brake engagement. I guess they aren't "touchy!" --R On 10/22/2010 7:21 AM, Rolf wrote: > Check the bushing on the brake pedal where it meets the rod that goes > into the booster. If this is missing or deteriorated then you get more > travel before braking. Otherwise is sounds like you need to bleed > more. Did you bleed all 4? > > -Rolf > > On 10/22/2010 7:14 AM, Rich Thomas wrote: >> So I got the new caliper on and hooked up, and system bled as best I >> could (there seems to be a lot of air leakage around the bleed >> nipples) with new fluid. The pedal feel is not a lot different from >> before, still seems to have about an inch of travel before getting >> much braking, and seems a bit soft though the brakes work OK. Might >> this be a master cylinder issue, or is that just the way they are? >> >> --R >> >> ___ >> http://www.okiebenz.com >> For new and used parts go to www.okiebenz.com To search list archives >> http://www.okiebenz.com/archive/ >> >> To Unsubscribe or change delivery options go to: >> http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com > > > ___ > http://www.okiebenz.com > For new and used parts go to www.okiebenz.com To search list archives > http://www.okiebenz.com/archive/ > > To Unsubscribe or change delivery options go to: > http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com > ___ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com -- next part -- A non-text attachment was scrubbed... Name: smime.p7s Type: application/x-pkcs7-signature Size: 5688 bytes Desc: not available URL: <http://okiebenz.com/pipermail/mercedes_okiebenz.com/attachments/20101022/2ecd32f4/attachment.bin> ___ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] Brakes, again (300SD)
Yes, all 4 in the proper sequence, twice. I'm thinking I should put some teflon tape on the bleeders to seal up those threads a bit and keep the air from getting in my bleed tube (using a Mityvac), though I don't think it is going back into the calipers. At first they were a bit mushy after I put on the new caliper and filled it and bled it a bit, so I went around the car again and then it was better, pretty much as it was before I started the exercise. I'll take a look at the bushing, but the pedal does not seem to have play in it, just takes some travel to start brake engagement. I guess they aren't "touchy!" --R On 10/22/2010 7:21 AM, Rolf wrote: Check the bushing on the brake pedal where it meets the rod that goes into the booster. If this is missing or deteriorated then you get more travel before braking. Otherwise is sounds like you need to bleed more. Did you bleed all 4? -Rolf On 10/22/2010 7:14 AM, Rich Thomas wrote: So I got the new caliper on and hooked up, and system bled as best I could (there seems to be a lot of air leakage around the bleed nipples) with new fluid. The pedal feel is not a lot different from before, still seems to have about an inch of travel before getting much braking, and seems a bit soft though the brakes work OK. Might this be a master cylinder issue, or is that just the way they are? --R ___ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com ___ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com ___ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] Brakes, again (300SD)
Check the bushing on the brake pedal where it meets the rod that goes into the booster. If this is missing or deteriorated then you get more travel before braking. Otherwise is sounds like you need to bleed more. Did you bleed all 4? -Rolf On 10/22/2010 7:14 AM, Rich Thomas wrote: So I got the new caliper on and hooked up, and system bled as best I could (there seems to be a lot of air leakage around the bleed nipples) with new fluid. The pedal feel is not a lot different from before, still seems to have about an inch of travel before getting much braking, and seems a bit soft though the brakes work OK. Might this be a master cylinder issue, or is that just the way they are? --R ___ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com ___ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
[MBZ] Brakes, again (300SD)
So I got the new caliper on and hooked up, and system bled as best I could (there seems to be a lot of air leakage around the bleed nipples) with new fluid. The pedal feel is not a lot different from before, still seems to have about an inch of travel before getting much braking, and seems a bit soft though the brakes work OK. Might this be a master cylinder issue, or is that just the way they are? --R ___ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
