I bought the Z back in Sept. And it would always squeek at the rear. I always kept an eye on the one side that squeeked but didnt realise all this time that the offside was over compensating and in Nov I found that the offside pads were down to metal but the nearside were like new, including the discs.

I found the pins were not as free as they should be.

I ordered new boots and cleaned the pins and carriers and installed new pads/discs and bled them.

I have noticed recently that the nearside is not breaking and the machining lines are still on the disc.

last week i fully dismantled the nearside caliper: removed it from the car, removed all the seals and removed the piston. I found light rust on the top of the piston as there was heavy rust where the metal clip holds the dust seal in the caliper.

I cleaned the piston and also used a dremel to tidy up the caliper and reassembled.

I noticed the inside of the piston (the area facing outwards) is very rusty and flaky so i too removed any loose pieces and ran a dremel sanding attachment inside.

On assemble i ran the piston in and out. and I bleed the caliper with an Visiibleed and had no bubbles. I also use this opportunity to make sure the hose wasnt expanding.

After a week its still not braking on the nearside.

I'm wondering now if the rust inside the piston is making it imbalanced / if i need a new seal inside the caliper even though theres no bubbles.

Do these cars have valves for the rear brakes or could this be an ABS fault?

Im very lost and not sure what to do next. I feel buying a new caliper could be a waste of money but i could be wrong.....

 

Change the whole caliper set, you can buy a rebuilt set in Autozone with a the core.

 

dead thread bump, original post was almost a year ago and the poster hasn't logged in going on 9 months

 

The new layout on this forum is horrible.