Winding in those rear calipers
06-25-2007, 10:29 AM
#25
Join Date: Jul 2002
Location: North Herts
Posts: 20,337
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by lower,Jun 25 2007, 05:53 PM
I dispute the idea that the fluid in contact with the piston gets dirty and therefore is better to lose by opening the bleed nipple than push back into the system.
However, cleaning the piston is always a good idea. If only because you don't get a build up of crud pushed into the bore inbetween the piston and the cylinder wall. It won't get in contact with the brake fluid, but it will make the piston more prone to jamming.
However, cleaning the piston is always a good idea. If only because you don't get a build up of crud pushed into the bore inbetween the piston and the cylinder wall. It won't get in contact with the brake fluid, but it will make the piston more prone to jamming.
Also, I think it's a little risky opening the bleed nipple as you stand a good chance of getting air in the system. I know this from trying 
06-25-2007, 10:46 AM
#26
Registered User
Originally Posted by Chris Type R,Jun 25 2007, 06:29 PM
Also, I think it's a little risky opening the bleed nipple as you stand a good chance of getting air in the system. I know this from trying If you read any service manuals they recommend not pushing the pistons in the the nipples closed. The ABS unit doesnt like fluid being forced into it
06-25-2007, 10:59 AM
#27
Join Date: Jul 2002
Location: North Herts
Posts: 20,337
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by Si2k,Jun 25 2007, 07:46 PM
You should give them a quick bleed them after opening the nipples anyway. I would, fresh pads deserve fresh fluid.
If you read any service manuals they recommend not pushing the pistons in the the nipples closed. The ABS unit doesnt like fluid being forced into it
If you read any service manuals they recommend not pushing the pistons in the the nipples closed. The ABS unit doesnt like fluid being forced into it
06-25-2007, 01:26 PM
#28
Can you explain why its bad to for fluid to be pushed through the abs unit? Under normal braking use when the abs isn't being tirggered there is some movement of brake fluid in both directions when you apply the brakes and then when you lift of the pedal and the run out of the discs pushes the pistons back in slightly. If it didn't and the abs unit reacted like a non return valve, once you apply the brakes they woudl stay applied.
06-25-2007, 02:02 PM
#29
Registered User
When you lift off the pedal the master cylinder simply removes pressure from the brake caliper and lines, there is no back flow.
There is a large amount of fluid in a piston and you need to force this to flow backwards against the ABS unit.
It may not cause damage, im not 100% sure, but I'd rather not take the risk
There is a large amount of fluid in a piston and you need to force this to flow backwards against the ABS unit.
It may not cause damage, im not 100% sure, but I'd rather not take the risk
