Home | Register | FAQ | Members List | Calendar | Today's Posts | Search |
Social Groups |
Registered
Members: 13,821 | Total Threads: 40,056 | Total Posts: 470,827 Currently Active Users: 765 (18 members and 747 guests) Welcome to our newest member, laxoqisaxqes |
|
|
Thread Tools | Display Modes |
18-06-12, 04:42 PM | #1 | |
Grown up member
Join Date: Apr 2012
Posts: 159
|
Rear caliper problem (Audi 80, B4)
Afternoon all!
Can someone please help me! I'm currently working on the brakes on my 1993 Audi 80. Basically on the rear I've done: New seals. - Took out the piston, changed the dust cover seal and the seal between the piston/bore of the caliper. New lines. New discs. New pads. New fluid. I've bled the system today and all of the brakes are working apart from the rear NS. With the brake pedal pressed it is still possible to spin the disc. If you pull the handbrake with a bit of fight you can still move the disc. I've tried the caliper on the OS and it still doesnt work so I know there isnt a problem with the lines. With the caliper off the car, if I pull the lever for the handbrake it acts like a ratchet and pushes the piston out, though it doesnt return when let go? Meaning the piston gets further out everytime I pul the lever, this doesnt seem right to me?? I've tested the caliper, still attached the lines but using a block of wood instead of pads/disc. and the piston simply doesnt move. Using a piston rewind tool the piston seems easy to move both in and out fairly easily so whats happening? I hope this all makes sense and someone can point me in the right directon! Regards, Andy |
|
18-06-12, 05:41 PM | #2 |
Grown up member
Classic Audi Club Member
Join Date: Dec 2011
Location: taunton
Posts: 790
|
Have you completly removed the piston? There must be a thread that works the handbrake mechanism? is that stripped?
|
18-06-12, 05:48 PM | #3 |
Grown up member
Join Date: Apr 2012
Posts: 159
|
yea I've took the piston out, the thread on both the piston and inside the caliper are fine. It's easy (relatively speaking to screw the piston on and off. I'm totally confused! . . . Just messaged someone on Ebay in sheffield who is breaking a cab, gonna try and get another caliper to test it out.
|
18-06-12, 05:51 PM | #4 | |
Grown up member
Classic Audi Club Member
Join Date: Dec 2011
Location: taunton
Posts: 790
|
Quote:
|
|
18-06-12, 05:53 PM | #5 |
Grown up member
Join Date: Apr 2012
Posts: 159
|
Nice one mate, thanks for taking the time to offer some adivce!
May take you up on that, how much would you want for one? PM me if you want. Cheers, Andy |
18-06-12, 05:58 PM | #6 |
4 ring whore!
Classic Audi Club Member
Join Date: Mar 2009
Location: Merseyside
Posts: 7,976
|
Don't know about the B4,but on my B2 you have to wind the pistons right back in.If you don't,the handbrake is weak.
It's something to do with the self adjusters,for the handbrake. Don't know if it's the same,on yours?But worth,a try.
__________________
q90 B2 Type 85 - q90 B2 Type 85-PROJECT-ABY 20vt KARL. Injection is nice but I'd rather be blown |
18-06-12, 06:02 PM | #7 |
Grown up member
Classic Audi Club Member
Join Date: Dec 2011
Location: taunton
Posts: 790
|
I recon the B4's are pretty much the same then. Maybe try winding the piston back in with the tool whilst opperating the handbrake lever.
|
18-06-12, 06:08 PM | #8 |
Grown up member
Join Date: Apr 2012
Posts: 159
|
I'll give you an answer shortly! Cheers!
|
18-06-12, 06:15 PM | #9 |
Senior Member
Classic Audi Club Member
Join Date: Oct 2009
Location: Derby
Posts: 1,166
|
I had the same thing with mine, it wasn't bleeding up right. The only way I managed to do it i nthe end was take the caliper off, pre-fill it with brake fluid and bleed it with a none-return valve.
__________________
1990 Coupe Quattro (WTF did I buy that for?) Half a 1983 Coupe FI (long term parts shelf) 2003 Cors-arrrgh More Polos that you'd ever believe No time, no money, all the wrong tools and a workshop that's too far away |
18-06-12, 06:29 PM | #10 |
Grown up member
Join Date: Apr 2012
Posts: 159
|
Right, screwed the piston all the way back in, bled the system (as well as I could with my mum pressing the brake pedal), locked the bleed nipple off.
Now with the brake pedal pressed you can just see the piston moving, but it only moves a few mm before stopping again, its like its catching on something inside. Like when you take a piston out using an air line, I was expecting the same thing to happen with the fluid - obviously I had a block of wood in the way to stop it firing onto next dorrs garden! lol |
Bookmarks |
|
|