Jon Ison
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| posted on 7/7/10 at 06:23 PM |
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Strange brake master cly problems ?
Anyone ever had this ?
Brake pedal without any warning gone absolutely rock solid ?
Thanks to Chris Mason had a go at looking into it but got no where other than I had moving brake pedal again but no brakes, zero.
I have cylinder in bench right now, put fluid in top absolutely nothing flows from the outlets, I know its fubard but never ever gained a solid pedal,
lost one yes but stuck solid ?
btw, it decided to do this at the end of a 120mph (GPS reading) straight earlier today at cadewll which leads nicely onto wanted......
Pair rear arches and sheet for a back panel, I count myself very lucky, bit of a stiffy in the neck and minimal damage to car
considering...........
A) it could have been on the road
B) it was a genuine 120mph incident only throwing it into a spin with the handbrake then making sure it went in backwards saved the day to minimal
damage.
Anyone ever had this or heard of such a failure before ? ?
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britishtrident
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| posted on 7/7/10 at 06:38 PM |
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Sounds like the push rod isn't allowing the master cylinder piston to come fully back, this is a very common problem with home builds.
[I] “ What use our work, Bennet, if we cannot care for those we love? .”
― From BBC TV/Amazon's Ripper Street.
[/I]
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Jon Ison
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| posted on 7/7/10 at 06:40 PM |
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That was my though but doesn't explain the malfunction on the bench ? The piston is full retracted.
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tomgregory2000
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| posted on 7/7/10 at 06:44 PM |
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Bent push rod?
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britishtrident
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| posted on 7/7/10 at 06:48 PM |
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quote:
Originally posted by Jon Ison
That was my though but doesn't explain the malfunction on the bench ? The piston is full retracted.
Pushrod is usually at an angle in the at rest position.
It just needs to block the piston by a tiny amount the size and shape of the mushroom end of the pushrod is critical.
[I] “ What use our work, Bennet, if we cannot care for those we love? .”
― From BBC TV/Amazon's Ripper Street.
[/I]
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mangogrooveworkshop
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| posted on 7/7/10 at 07:08 PM |
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just had a mc do a very similar thing. It kept on locking up and the wheel cylinders would eventually clamp the fronts until they stopped only letting
go once I cracked a brake union nut letting out the pressure. The mc had been pushed a few times dry as we were repositioning the pedals. It also had
a leak into the footwell...
replaced it 38 quid
[Edited on 7-7-10 by mangogrooveworkshop]
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Jon Ison
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| posted on 7/7/10 at 07:09 PM |
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but..........
The cylinder is on the bench, reservoirs out, pistons fully retracted, fill with fluid just sits there nothing is flowing ?
What am I missing ? Obviously some sort of blockage but what ?
Ive always bled brakes this way on 1st install, remove all bleed nipples fill with fluid, let it bleed itself ?
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Jon Ison
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| posted on 7/7/10 at 07:10 PM |
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quote:
Originally posted by mangogrooveworkshop
just had a mc do a very similar thing. It kept on locking up and the wheel cylinders would eventually clamp the fronts until they stopped only letting
go once I cracked a brake union nut letting out the pressure. The mc had been pushed a few times dry as we were repositioning the pedals. It also had
a leak into the footwell...
replaced it 38 quid
[Edited on 7-7-10 by mangogrooveworkshop]
This was the opposite, the brake pedal was stuck at the top, solid as a rock not brakes locked on, locked off ?
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