Vehicle & Technical > Discovery
Changing rear hub bearings...***EDIT, caliper's siezed!***
Iain C:
Well, just went out for a poke around before I ordered anything...the scrapey noise is actually a siezed NSR caliper! Oh joy!
Jacked it up and as it happens there is a barely perceptible amount of play from the wheel bearings...certainly no more than at MOT time. The wobble I could feel when the truck was sat on it's wheels must be something else!
It's pretty obvious that it could probably do with discs and pads all round...that's a pain as it means the hubs need to all come apart anyway.
So...my new questions are as follows!
Is it even remotely possible to resurrect a siezed caliper with careful use of fine wet and dry and a new seal kit, or is it a case that if it's siezed it's almost certainly knackered beyond repair?
And whilst I'm at it should I just change the wheel bearings anyway?
(PS AAAARRRRRGGGGHHHHHHHHH on the phone to a well known LR "specialist" who just said "we don't do handbrake shoes, it's discs on the back!!!!!!) :roll:
bilge rat:
iff your sure the noise is just the seized caliper . just re grease the brg and reset. when yourve got it out have a look for pitting ?. i got away with my caliper about a year ago and still o.k. at the time i didnt think i could save it .but was wrong. did do my wheel brg on blue due to water contamination the grease had turned like grey brown. so iff your grease is this colour id change the back seal and brg . good luck. alan.....
Les Henson:
You can clean-up the caliper pistons if you are careful. Remove the pads and use foot pressure to move the pistons out and then clean the rust off and spray them with WD40. Push them back in with a pry bar of G-clamp, then out again with foot pressure and clean once again until they move smoothly. You can rebuild a caliper - pistons and seals are available standard or in stainless. How to do that is here -
http://forums.lr4x4.com/index.php?showtopic=2851
If the grease in the wheel bearings is contaminated or the tracks pitted, then replace them as well - along with the seal.
Wheel bearing (defender, but the same method) -
http://forums.lr4x4.com/index.php?showtopic=10286
Les.
Iain C:
Les, great info, thanks very much.
2 more questions for you...
1-If the caliper is siezed to the extent that with the engine not running (no servo assistance) and the brake pedal partly wedged down with the jack handle, I can actually still turn the roadwheel by hand, am I likely to be able to still rebuild the caliper or will it be too far gone? With the same pressure on the brake, the other wheel was locked up, so the NSR in question is very lazy! Is it just the piston that corrodes, and the bore is likely to be OK?
2-Do you have to split the caliper to get the pistons out? I'm just worried about not being able to find these O rings...I saw the linky on the other site but I have no idea which size I would need.
Thanks
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