Rubber sleeve around brake caliper piston
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Rock Crawling
Joined: Jul 2007
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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.
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Rock Crawling
Joined: Jul 2007
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On a side note, how many brake pad sensors are there? One for rear and front? One for just the rear? Two for rear? It would appear only my right side has a sensor wire and there’s never been any indication in the cabin
Recovery Vehicle
Joined: Aug 2013
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From: Boston, USA
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
Recovery Vehicle
Joined: Oct 2018
Posts: 943
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From: Colorado
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.
Drifting
Joined: Jul 2019
Posts: 28
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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.
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Rock Crawling
Joined: Jul 2007
Posts: 448
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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
Thread Starter
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Rock Crawling
Joined: Jul 2007
Posts: 448
Likes: 79
From:
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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