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  #11  
Old 19-11-10, 21:03
Monkey Wagon Monkey Wagon is offline
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Default Re: brake pedal goes to floor, pants fill up

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Originally Posted by Monkey Wagon View Post
Hi Snedboy,

How did you get on with changing the master cylinder - did it solve the problem?

I recently changed a rear wheel cylinder, bled the brakes and after a week I have the same problem as you; If I press the brakes slowly they (sometimes) go to the floor, if I prod them they're fine.

Sounds like seals to me.
update:

New mastercylinder from GSF 35 ish (same as golf mkiii, and passat apparently), changed the wheel cylinders too, which were at the end of their life. seemed to solve the pedal issue, but after several re-bleeds the back was locking up too easily.

Went for the MOT and now it failed on the pressure regulator seized.

Come on van, where's the love
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  #12  
Old 20-11-10, 10:20
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snedboy snedboy is offline
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Default Re: brake pedal goes to floor, pants fill up

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Originally Posted by Monkey Wagon View Post
update:

New mastercylinder from GSF 35 ish (same as golf mkiii, and passat apparently), changed the wheel cylinders too, which were at the end of their life. seemed to solve the pedal issue, but after several re-bleeds the back was locking up too easily.

Went for the MOT and now it failed on the pressure regulator seized.

Come on van, where's the love
35 My local branch of Eddie Walker quoted me 100-130 the theiving basrds. Thanks for the heads up I'll get onto that straight away and yes they can be hard to love sometimes.
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  #13  
Old 20-11-10, 10:36
sailingmania sailingmania is offline
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Thumbs up Re: brake pedal goes to floor, pants fill up

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Originally Posted by alfieralph View Post
When you pump the pedal to get the correct level you should find that when you apply the brakes you get a solid pedal. If this is the case then you need to bleed your brakes again. If your pedal slowly sinks to the floor then you have a seal problem. Check your reservior level to see if your losing any fluid. If your fluid is down then check your caliper/wheel drums pistons for signs of a leak.

I used to drive an old mini, the brakes used to fail quite often so i know what you mean when you say your pants fill up
so did i! theyre an awesome car! so old yet so good! i had a 1982 1275cc, with with minilites, straight through exhaust, no silencer, it ROARED! stage 1 kit! ahhh it was the biz! metallic blue, with white stripes and a white roof with a vinyl target on the top! LOL can show pics if youre intereted? any ways back to t4's / t5's!
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  #14  
Old 21-11-10, 13:49
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snedboy snedboy is offline
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Default Re: brake pedal goes to floor, pants fill up

Master cylinder ordered from Justkampers for 44.91.
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  #15  
Old 16-03-14, 21:59
jensjakob jensjakob is offline
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Default Re: brake pedal goes to floor, pants fill up

Did a new mastercylinder solve the issue?

I have the same. Hard push gives me rockhard brakes that doesnt sink.

Slow soft push - pedal goes to the floor....
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  #16  
Old 16-03-14, 22:22
lyndon1 lyndon1 is offline
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Default Re: brake pedal goes to floor, pants fill up

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Originally Posted by jensjakob View Post
Did a new mastercylinder solve the issue?

I have the same. Hard push gives me rockhard brakes that doesnt sink.

Slow soft push - pedal goes to the floor....
Sounds like a vacuume/ servo issue I have the same problem!
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  #17  
Old 16-03-14, 22:23
jensjakob jensjakob is offline
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Default Re: brake pedal goes to floor, pants fill up

Why vacuum/servo problem? Even with a vacuum leak - the pedal should go hard before reaching the floor?
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  #18  
Old 16-03-14, 22:48
lyndon1 lyndon1 is offline
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Default Re: brake pedal goes to floor, pants fill up

Slight servo help with slow pedal and a quick hard push no vacuume in servo
Could be mc but they normally are consistent when failing
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  #19  
Old 22-03-14, 22:43
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snedboy snedboy is offline
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Default Re: brake pedal goes to floor, pants fill up

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Originally Posted by jensjakob View Post
Did a new mastercylinder solve the issue?

I have the same. Hard push gives me rockhard brakes that doesnt sink.

Slow soft push - pedal goes to the floor....
The van's been off the road since I ordered the master cylinder. I'm currently overhauling my calipers so brakes should be nearly new by the time I'm finished
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  #20  
Old 23-06-19, 16:18
dossbag dossbag is offline
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Default Re: brake pedal goes to floor, pants fill up

This is an old thread but I'd like to suggest another possible cause of the brake pedal sinking to the floor.
I'm driving a T4 1.9td abl converted to a camper.
A while back I started having a problem with the brake pedal going solid when maneuvering, as though there was no vacuum assist.
After a lot of head scratching and the help of a vacuum gauge I narrowed it down to the vacuum pomp.
Turns out it was half full of oil, guess a seal had gone, so not building up vacuum quickly.

After replacing it (scrap yard parts) the problem was solved.
I then set about trying to figure out why the brake pedal would sometimes slowly sink to the floor if I held pressure on it, this happened while the vehicle was stationary.
Couldn't find any leaks and no loss of fluid, brought me to the conclusion that it must be the master cylinder seals were worn.
Fitted a new master cylinder and lo and behold still had the same problem.
Much head scratching!!
Anyway I discovered that if I held the engine revs (2000 or so) and pressed the brake pedal with my left foot the brake pedal didn't sink anymore.
This brought me to the conclusion that when I pressed the brakes at tick over as the brake pedal is depressed the reason that it sinks is due to the vacuum slowly building up therefore increasing the force through the braking system.
Turn the engine off, press the brake it is solid, start the engine and the pedal sinks, vacuum pressure building up..
Stamp a couple times on the pedal and then hold it sinks, vacuum pressure building up.
My conclusion is there are no problems with the braking system it's a result of the vacuum pomp not working to full capacity.
Will be fitting a replacement vacuum pump shortly
That's my suggestion to this problem!
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