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Old 09-17-2012, 03:53 PM
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HELP! Wj Rear brake pistons dont fit!

Help Please!
I had a sticky rear caliper on my WJ Grand Cherokee.
Bought new pads for Teves along with Crown replacement piston and ring type seal
Stripped caliper, ejected sticky piston [It is showing heat damage and a small crack in the bearing surface.]
Old seal looked same as new not swollen!
Cleaned out chamber lubed with fresh fluid and tried piston without seal.
Alarm Bell!
Piston would not enter past chamfer/seal groove ??????
Diameter too big Interference fit !
Compared with old piston .... appeared same except slightly shorter
Did not have a means to measure accurately at the time.
Needed to be mobile so cleaned old piston and polished with 600 wet and dry and tested fit ..... no sticking so reassembled as temp measure with new seal!
Contacted supplier who will send replacement if I ship the piston back to him but the problem remains.......
The box says Crown Automative replaces 5011983AA but .... Is the piston in the right box or are my calipers non standard?
Can anyone tell me what dimensions the piston in the rear caliper should be?

I cannot measure the existing without stripping everything again and putting the jeep out of service and sending the non fitting piston back for swap may be pointless!
I seem to remember the old piston has KK7 embossed on the bottom but the new one is unmarked so size will be the only identification!!
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Old 09-19-2012, 07:23 PM
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Re: HELP! Wj Rear brake pistons dont fit!

I would buy a whole new caliper. For under $50 for a new one it's not worth the bother.
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OK, fine...I'll admit...some amber lamps are good, and necessary.
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Old 09-23-2012, 11:22 AM
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Re: HELP! Wj Rear brake pistons dont fit!

I wish!
Non OEM Rear caliper here in the UK without spring or pins delivered 101.00

Thats $165 of your lovely dollars!

I dare not ask the Main Stealer

Piston and seal and boot $32 for Crown!

I used to buy in USA and ship over but the rapid rise in shipping costs have killed that along with the Import duty and Value Added Tax and tax collection charge!
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Old 09-24-2012, 05:23 PM
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Re: HELP! Wj Rear brake pistons dont fit!

Hmm sounds like you need a friend over here who you can send money to, have them buy and send the part to you.
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Old 09-25-2012, 08:42 PM
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Re: HELP! Wj Rear brake pistons dont fit!

Quote:
Originally Posted by aislingean View Post
I wish!
Non OEM Rear caliper here in the UK without spring or pins delivered 101.00

Thats $165 of your lovely dollars!

I dare not ask the Main Stealer

Piston and seal and boot $32 for Crown!

I used to buy in USA and ship over but the rapid rise in shipping costs have killed that along with the Import duty and Value Added Tax and tax collection charge!
Wow i see where you're coming from! Wonder if its oversize to account for honing the bore? Sad part is probably not gonna find to much info on the piston from us in the states because we usually just go get a rebuilt caliper for an extra $20
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OK, fine...I'll admit...some amber lamps are good, and necessary.
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Old 09-26-2012, 10:24 AM
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Re: HELP! Wj Rear brake pistons dont fit!

Was it really the piston which was sticking and not the sliding pins of the caliper? I know the front caliper pistons (Akebono) are made of phenolic resin, is that the same for the aft calipers?
No scrapyard in the nabourhood where you could find some calipers?
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