Check the new master cylinder. The new replacements have a different depth
hole for the push rod than the origingals. Change pushrod to right length
if has deep hole. Push rod for somewhere in 70's Malibu's usually about
right. Had this problem and all brake places around could not find. I
found my original master cylinder and compared the two. That is how I found
this problem. Might be something to look for.
John
----- Original Message -----
From: "John Nasta" <[EMAIL PROTECTED]>
To: "The Chevelle Mailing List" <Chevelle-list@chevelles.net>
Sent: Monday, February 20, 2006 9:51 PM
Subject: Re: [Chevelle-list] 69 Chevelle brake pedal drops to floor
Could be a blown rubber brake hose or other bad leak. The level in the MC
being only 1/4" low could mean that it just blew recently. If the level
keeps getting lower as you use the brake, you definitely have a leak (you
can test this w/o actually driving anywhere). Check around the rubber
hoses,
backing plates, and wheel cylinders to see if they have been wet recently.
Try the brake several time w/ the car parked and running, and see if there
are any fresh drips under the car after applying the brake a bunch of
times.
Don't "test" it so many times that you run the MC dry, but if the level
continues to drop, you have a leak. If the level stays the same but the
pedal keeps going to the floor even if you pump it, it's probably the MC.
p.s. It helps to use a relevant subject line.
-----Original Message-----
Need some advice on brakes.....Second time out last April, my brakes
failed on my '69 Chevelle. Had a repair shop that I have delt with in the
past and was very satisified with their work look at and make the repairs.
The master cylinder was replaced as well as the rear shoes and rebuild the
rear wheel cylinders . Checked the front discs and they were fine . Brakes
were working fine until yesterday...brake pedal went to the floor and the
brake lite came on . Good thing this happened in my driveway and not on
the
road like the last time the brakes failed . Put the car back in the garage
and checked the brake fluid level and it fine, about a 1/4" fom the top.
The
brake job has less then 1000 miles on it. Any ideas went could have
happened
? Could it be the vacuum booster?
Thanks ,
Pete Hnat
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