Rubber sleeve around brake caliper piston
#1
03-16-2021, 12:58 PM
Rubber sleeve around brake caliper piston
The rubber sleeve around the piston. Does it have a functional use to stop brake fluid or is it there for dust collection? I was replacing my rear brakes yesterday and there’s two screws holding the electric brake motor on the top. I went to undo one of the motors to wind the brake back and the screw stripped. My only other option was to rotate the piston using rubber ended channel lock pliers until it was fully retracted. In doing so the rubber sleeve slipped out. Wondering if I should be worried or not. The housing for the piston appears to have a seal built into its walls so I’m hoping that’s enough.
#2
03-16-2021, 03:01 PM
#3
03-16-2021, 07:17 PM
I don't know on your first question unfortunately.
On the wear sensors, there is one per axle. Front left and back right. Each one measures pad thickness of the inner pad
The LR oem ones are expensive - can get aftermarket much lower cost. If it hasn't triggered the low pad light you might be able to reuse the sensor but usually the heat from the brakes makes the plastic brittle and they break as you remove them
On the wear sensors, there is one per axle. Front left and back right. Each one measures pad thickness of the inner pad
The LR oem ones are expensive - can get aftermarket much lower cost. If it hasn't triggered the low pad light you might be able to reuse the sensor but usually the heat from the brakes makes the plastic brittle and they break as you remove them
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gmfain (03-18-2021)
#4
03-16-2021, 08:02 PM
Recovery Vehicle
Did you damage that rubber sleeve or are you just unable to reinstall it?
I doubt very much that it has anything to do with retaining brake pressure.
It's probably a dust and dirt protection.
I have a damaged spare rear caliper in a box in my garage with good seals.
I can pull it out tomorrow and take pictures for you.
I doubt very much that it has anything to do with retaining brake pressure.
It's probably a dust and dirt protection.
I have a damaged spare rear caliper in a box in my garage with good seals.
I can pull it out tomorrow and take pictures for you.
#5
03-17-2021, 02:21 PM
You really want to replace that seal. It is just a dust/debris seal, but it protects the piston wall and inner hydraulic seal from being damaged by debris. Running without it could cause the piston/inner seal to be damaged, possibly requiring you to have to replace or rebuild the entire caliper.
As far as sensors go, there is one on the front axle and one on the rear axle. When I bought the Power Stop Z36 front and rear brake kits back in 2019, it came with the replacement sensors as well.
As far as sensors go, there is one on the front axle and one on the rear axle. When I bought the Power Stop Z36 front and rear brake kits back in 2019, it came with the replacement sensors as well.
#6
03-20-2021, 02:00 PM
I don't know on your first question unfortunately.
On the wear sensors, there is one per axle. Front left and back right. Each one measures pad thickness of the inner pad
The LR oem ones are expensive - can get aftermarket much lower cost. If it hasn't triggered the low pad light you might be able to reuse the sensor but usually the heat from the brakes makes the plastic brittle and they break as you remove them
On the wear sensors, there is one per axle. Front left and back right. Each one measures pad thickness of the inner pad
The LR oem ones are expensive - can get aftermarket much lower cost. If it hasn't triggered the low pad light you might be able to reuse the sensor but usually the heat from the brakes makes the plastic brittle and they break as you remove them
#7
03-20-2021, 02:01 PM
You really want to replace that seal. It is just a dust/debris seal, but it protects the piston wall and inner hydraulic seal from being damaged by debris. Running without it could cause the piston/inner seal to be damaged, possibly requiring you to have to replace or rebuild the entire caliper.
As far as sensors go, there is one on the front axle and one on the rear axle. When I bought the Power Stop Z36 front and rear brake kits back in 2019, it came with the replacement sensors as well.
As far as sensors go, there is one on the front axle and one on the rear axle. When I bought the Power Stop Z36 front and rear brake kits back in 2019, it came with the replacement sensors as well.
I gladly would but for the life of me I can’t figure out how that rubber housing is attached.
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