Hi Jim, I didn't know that. At the moment I have no pressure at the pedal and full travel.
I guess if I refitted the original set up that yourself and Matthew fitted and I have brakes again then it points towards the master cylinder being too small to cope with the Hispec set up (same as Willwood). Not a huge job, it's just finding time to do it that's the problem. As it's only me that drives the car, I'm not overly concerned about removing the servo ( if I take that route). Bob Sent from my iPad > On 25 Mar 2019, at 09:12, Jim Hearne <j...@quantums.info> wrote: > > I had the same problem when i put Willwood 4 pot calipers on my 2+2, that has > the early brake setup. > > There are 2 different brake pedals with the hole for the bar that goes > through the bulkhead in different places, one gives you more pressure on the > master cylinder but at the expense of more pedal travel. > I may have a picture somewhere. > I drilled another hole in the already better option pedal , even higher up, > this helped with the pressure but gave more pedal travel. > > It certainly stops now, i did a couple of track days in it. > I also have a feeling that the brake pads either glazed or weren't the best > material choice, i bought another set of a more road spec but never got > around to fitting them to see if they made a difference. > > I thought i may have been loosing travel with the servo brackets flexing so i > plated in the open sides and strengthened to ends, but this made no > difference. > You can also adjust the pushrod in the servo to remove any play before the > pushrod contacts the end of the master cylinder. > But, be careful with this, i got it too close and it wasn't letting the > master cylinder fully retract. > This had the effect that as the fluid got hot it gradually applied the > brakes, not so good. > > What bore is your master cylinder ?, it should be stamped on the side. > > I know anything with a bias bar won't pass an IVA test unless it's welded up > but not sure if it's an MOT failure. > Also, without a servo you will need some muscles. > > Jim > > > > > -----Original Message----- From: 'Bob Craig' via Quantum Owners Group > Sent: Sunday, March 24, 2019 5:39 PM > To: Quantum Owners Group > Subject: [Quantum Owners] Brake master cylinder conversions > > After upgrading my already upgraded 2+2 brakes from Cosworth single piston > calipers and huge discs to a much lighter Hispec billet 4 pot system, I can't > get a decent brake pedal and have next to no braking force. I purged all the > old brake fluid and refilled with dot5.1, pressure bled everything. I'm > thinking that my master cylinder may be faulty and just looking at options. I > know the later type cylinder is a bit like rocking horse poo these days and > if going to the extent of changing, I'd rather have a more performance > focused set up. > Has anyone fitted the Burton Power bias assembly. It does away with the > standard servo and master cylinder. > > https://www.burtonpower.com/adjustable-bias-brake-assy-ford-fiesta-mk1-mk2-mk3-brk061.html > > Bob > > -- > -- > You received this message because you are subscribed to the Google Groups > "Quantum Owners Group" group. > To post to this group, send email to quantumowners@googlegroups.com > To unsubscribe from this group, send email to > quantumowners-unsubscr...@googlegroups.com > For more options, visit this group at > http://groups.google.com/group/quantumowners?hl=en > > IMPORTANT NOTE: All information presented herewith is provided on an "As Is" > basis, without warranty or the implication thereof. Neither the Quantum > Owners Club nor the individuals associated with the Quantum Owners Club or in > the preparation of the above information shall have any liability to any > person or entity with respect to liability, loss, or damage caused or alleged > to be caused directly or indirectly by the instructions contained within this > or related message(s). > --- You received this message because you are subscribed to the Google Groups > "Quantum Owners Group" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to quantumowners+unsubscr...@googlegroups.com. > For more options, visit https://groups.google.com/d/optout. > -- > -- > You received this message because you are subscribed to the Google Groups > "Quantum Owners Group" group. > To post to this group, send email to quantumowners@googlegroups.com > To unsubscribe from this group, send email to > quantumowners-unsubscr...@googlegroups.com > For more options, visit this group at > http://groups.google.com/group/quantumowners?hl=en > > IMPORTANT NOTE: All information presented herewith is provided on an "As Is" > basis, without warranty or the implication thereof. Neither the Quantum > Owners Club nor the individuals associated with the Quantum Owners Club or in > the preparation of the above information shall have any liability to any > person or entity with respect to liability, loss, or damage caused or alleged > to be caused directly or indirectly by the instructions contained within this > or related message(s). > --- You received this message because you are subscribed to the Google Groups > "Quantum Owners Group" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to quantumowners+unsubscr...@googlegroups.com. > For more options, visit https://groups.google.com/d/optout. -- -- You received this message because you are subscribed to the Google Groups "Quantum Owners Group" group. To post to this group, send email to quantumowners@googlegroups.com To unsubscribe from this group, send email to quantumowners-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/quantumowners?hl=en IMPORTANT NOTE: All information presented herewith is provided on an "As Is" basis, without warranty or the implication thereof. Neither the Quantum Owners Club nor the individuals associated with the Quantum Owners Club or in the preparation of the above information shall have any liability to any person or entity with respect to liability, loss, or damage caused or alleged to be caused directly or indirectly by the instructions contained within this or related message(s). --- You received this message because you are subscribed to the Google Groups "Quantum Owners Group" group. To unsubscribe from this group and stop receiving emails from it, send an email to quantumowners+unsubscr...@googlegroups.com. 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