rear VW2001 calipers:can't push in piston
#1
rear VW2001 calipers:can't push in piston
Hi all,
I'm in the process of replacing the rear brake pads and all is well BUT... I can't push the piston inward even with great force...
I suspect an anti-return valve or device since it's the rear brakes and they're coupled with the mechanical parking brake.
Here's 2 things I noticed:
In the back of the caliper there's a Torx screw that I don't know what's the use for and the face of the piston has 2 "v" shaped indentations that seem's to be there for inserting a special tool for turning the piston maybe???
I've changed front pads before without hassle so I did succeed in pushing in pistons...
Any help is greatly appreciated
BTW, model is Sharan (mini-van in Europe) most probably the same calipers as other VW like Passat or Golf
I'm in the process of replacing the rear brake pads and all is well BUT... I can't push the piston inward even with great force...
I suspect an anti-return valve or device since it's the rear brakes and they're coupled with the mechanical parking brake.
Here's 2 things I noticed:
In the back of the caliper there's a Torx screw that I don't know what's the use for and the face of the piston has 2 "v" shaped indentations that seem's to be there for inserting a special tool for turning the piston maybe???
I've changed front pads before without hassle so I did succeed in pushing in pistons...
Any help is greatly appreciated
BTW, model is Sharan (mini-van in Europe) most probably the same calipers as other VW like Passat or Golf
#2
Virtually all rear disc pistons require a special tool to twist them as you press them in
The pistons are threaded
I'm sure you are correct about the V being the spot for the tool on VWs
The pistons are threaded
I'm sure you are correct about the V being the spot for the tool on VWs
#4
hello again,
Well, the service manual says that the piston has to be screwed in, clockwise of course, and if the special tool is not available, then a circlip pliar can be used to turn the piston. there's a photo showing just that.
Now the fun part, I managed to screw in the right side, installed everything back on and all is well. EXCEPT... the left side seems to have a mind of it's own as it will go in only as far as about half way, then any amount of turning is of no use... My arm is seriously aching at this point...
I've tried unscrewing at bit the bleeder valve to releave hydraulic pressure to no avail. Someone suggested pumping the hand brake till the piston is fully out then turning. tried that twice and can only go to half way point...
Any other suggestions??
thanx
Well, the service manual says that the piston has to be screwed in, clockwise of course, and if the special tool is not available, then a circlip pliar can be used to turn the piston. there's a photo showing just that.
Now the fun part, I managed to screw in the right side, installed everything back on and all is well. EXCEPT... the left side seems to have a mind of it's own as it will go in only as far as about half way, then any amount of turning is of no use... My arm is seriously aching at this point...
I've tried unscrewing at bit the bleeder valve to releave hydraulic pressure to no avail. Someone suggested pumping the hand brake till the piston is fully out then turning. tried that twice and can only go to half way point...
Any other suggestions??
thanx