Brake disc replacement!!! GGrrrrr

steve-o · Jun 17, 2010

Hi folks,

PADS NOT DISCS!!!!

bit of a problem! I have replaced my front pads tonight and have a problem!!! Went in no problem, calipers went back with some effort fine, plenty of fluid in the reservoir BUT pumping and pumping to pedal and I have NO BRAKES at all.

What have I/am I doing wrong?

Sorry to sound such a doughnut, i've replaced them before and they just pumped straight up tight. What could it be!!!????

steve-o · Jun 17, 2010

My neighbour said I might have reversed the seal on the master cylinder. Is that possible and likely? How would I check?

taffi_jj · Jun 17, 2010

it is entirely possible. i believe it happens when the piston is pushed back too fast. the only way i know of checking/ sorting it is to strip the master.

steve-o · Jun 17, 2010

My neighbour has suggested I do a bleed anyway and see if that sorts it.

andyb66 · Jun 17, 2010

This is why I always open the bleed nipple on the caliper when pushing the pistons back.

A pressure bleed may help, but stripping the master cylinder to sort out the seal isn't difficult.

90truckcab · Jun 17, 2010

yer could well of done the master cylinder

beverage · Jun 18, 2010

tbh mate if you got nothing on the brakes the master probably a good place to start. you could try eazi bleed but if you have NOTHIN AT ALL then its not gunna be on the caliper even with a little air in the system the brakes will work after a couple of pumps.

beverage · Jun 18, 2010

andyb66 said:
This is why I always open the bleed nipple on the caliper when pushing the pistons back.

A pressure bleed may help, but stripping the master cylinder to sort out the seal isn't difficult.

good advice!!!!!!!!!!!!!! forgot to mention that...

steve-o · Jun 18, 2010

Is it likely that the seal can be replaced/repositioned? I have looked in the Haynes manual, I am thinking for 45 quid a new master cylinder might be easier!!!

paul_c · Jun 18, 2010

I'd rather pop a seal in the workshop than on the road. If you disrupted a seal on the MC pushing the caliper back, the MC is overdue a change. They will flip due to the seal going stiff or the cylinder having corrosion on it.

steve-o · Jun 20, 2010

Ok folks......the dilemma continues.

I have just tried to bleed the brakes and all I get is a little oil/air into the pipe on the push and it returns on the lift. Tried a one way valve and "old style" bleeding.

Does this sympton suggest Master cylinder is more likely??

steve bain · Jun 20, 2010

please explain how you are doing the bleeding. is it your technique?

steve-o · Jun 20, 2010

Using a one way valve on a tube, open nipple, pump brakes.

I then tried JUST tubing, open nipple push brakes, close nipple, release peddle, open nipple, push peddle, close nipple......and so on.

Both offered the same result.

Its as though something isn't allowing any pressure to be built up if you know what I mean!

paul_c · Jun 20, 2010

Are all the brake lines completely tightened? Plenty of brake fluid in the reservoir? No kinked (solid) brake lines?

If so, then the only thing it could be is the master cylinder, since the fluid goes directly into it by gravity then is held in with the master cylinder's seals.

steve-o · Jun 20, 2010

Thanks for the advice.

The reservoir is full to full, all lines are as they were before I did pads.

I reckon I pushed them back way too quickly and with the force of ten elephants!!!

I'll order as new MC in the morning. Local one for £55 sound about right for a '96 300tdi?

Brake disc replacement!!! GGrrrrr

steve-o

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