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Old 21st October 2016, 22:32   #1
Chuckles
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Default Brake bleeding not working

I have just replaced the ABS/TC modulator unit, c/w plug wiring loom but when i went on to bleed the brakes ..... nothing. Tried conventional pedal, pressurizing and suction. No fluid movement.
I have come to the conclusion that there may be a fault with the master cylinder but cannot find supplies of a master cylinder repair kit.
The system was without pressure for a few months so assumed the cups in the master cylinder have shrunk.
Any ideas?
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Old 21st October 2016, 22:34   #2
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Try the link below
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Old 22nd October 2016, 03:25   #3
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Quote:
Originally Posted by Chuckles View Post
I have just replaced the ABS/TC modulator unit, c/w plug wiring loom but when i went on to bleed the brakes ..... nothing. Tried conventional pedal, pressurizing and suction. No fluid movement.
I have come to the conclusion that there may be a fault with the master cylinder but cannot find supplies of a master cylinder repair kit.
The system was without pressure for a few months so assumed the cups in the master cylinder have shrunk.
Any ideas?
Have you tried pressure and pumping at the same time. I had a few moments once when i thought i had blown a seal somewhere, but conventional bleeding whilst the pressure tank was still connected at about 20psi shifted things along.
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Old 22nd October 2016, 07:11   #4
Chuckles
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Thank you for your replies Chaps. I will try again but I think we have exhausted our efforts here. The link was very useful, and a bit worrying as I cannot move the car in its present state to get it to a T4 chap.

We have tried all methods.

Started by conventional non power assisted pedal and bleed. The pedal straight to the floor, (as would be expected with a new ABS/TC unit) - It was brand new! and yes all plugs removed. Then with engine running.

2nd Method; Pedal and vacuum, both hand pump and compressed air line type, again with using the pedal as well; engine off then on.

3rd Method; Pressurise the master reservoir. Could not get pressure to stay. Hand pumped up to 15-20 psi but it dropped off straight away.

Asking around the workshops here the general consensus was that after the brake system was drained (ABS unit removed) the piston seal(s) in the Master Cylinder may have shrunk. The system was dry for a few months over the summer as I was tied up with other things at the time.

So I have looked for a master cylinder kit but no luck there. The only things found was a host of S/H units (very reluctant as I may end up with the same problem) and one very expensive new unit. As it has cost the best part of £800+ already with looms and ABS/TC units the budget is getting a bit thin!
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Old 22nd October 2016, 07:43   #5
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Have you tried opening all of the bleed nipples and leaving the top off of the reservoir.
The fluid should creep through under gravity, then close each nipple as the fluid reaches the caliper.
This should flood the system and swell the seals again. Then try bleeding as normal...
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Old 22nd October 2016, 08:02   #6
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Quote:
Originally Posted by Chuckles View Post
Pressurise the master reservoir. Could not get pressure to stay. Hand pumped up to 15-20 psi but it dropped off straight away.
Doesn't that suggest that you have a puncture? Smear a soapy solution around all the unions which you have disturbed, then pressurise it again with air.

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Old 22nd October 2016, 08:39   #7
Chuckles
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Quote:
Originally Posted by klarzy View Post
Have you tried opening all of the bleed nipples and leaving the top off of the reservoir.
The fluid should creep through under gravity, then close each nipple as the fluid reaches the caliper.
This should flood the system and swell the seals again. Then try bleeding as normal...
I will try that.
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Old 22nd October 2016, 08:40   #8
Chuckles
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Doesn't that suggest that you have a puncture? Smear a soapy solution around all the unions which you have disturbed, then pressurise it again with air.

Simon
There are no leaks - yet!
I cannot comment on the reliability of the pump, although new(ish) but assumed the reservoir does not hold pressure.
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Old 22nd October 2016, 09:06   #9
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The only way I could get a decent pedal back after the renewal of a brake pipe on the v8 was to have it put on a t4!
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Old 22nd October 2016, 11:02   #10
SD1too
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Quote:
Originally Posted by Chuckles View Post
Could not get pressure to stay. Hand pumped up to 15-20 psi but it dropped off straight away.
Quote:
Originally Posted by Chuckles View Post
There are no leaks ..
To where is the air escaping then, given that the system should be sealed?
Quote:
... assumed ...
Ooh, a dangerous, and potentially expensive word.

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