GQ front wheel bearings

Submitted: Monday, Jan 03, 2011 at 18:28
ThreadID: 83409 Views:2068 Replies:5 FollowUps:3
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to all you mechanics how hot should the hub be after a drive
I bled all the brakes went for a drive 20 klm and could not hold my hand on the front hubs.What are your suggestions.
Regards Garny.
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Reply By: Member - Graham H (QLD) - Monday, Jan 03, 2011 at 19:04

Monday, Jan 03, 2011 at 19:04
Did you check to see if brake pads were dragging on the rotors.

Shouldnt be any more than mildly warm.

AnswerID: 440598

Reply By: nick b - Monday, Jan 03, 2011 at 19:18

Monday, Jan 03, 2011 at 19:18
depending on your pain tolerance ! i offen check hub& tyre temp with hand when on a drive but hav'nt ever had that hot that could;nt hold hand on . but if you were jumping on brakes that heats up hubs .
what about before you bled ?
mite need to check bearing any way .
Cheers Nick b

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AnswerID: 440599

Reply By: Axle - Monday, Jan 03, 2011 at 19:36

Monday, Jan 03, 2011 at 19:36
Hi Garny, It could be a build of pressure from the master cylinder, as you travel, The Hubs may spin free when jacked up, but out driving for a while If the freeplay on the pedal to master cyl is not correct it can start to actually put brake pessure on, or if the master cyl ihas a slight leak it can cause havoc also, There was a long time member hear that had tha same prob, with the same vehicle, But Atlas and with great determent to this forum he's gone!

Cheers Axle
AnswerID: 440602

Follow Up By: garny - Monday, Jan 03, 2011 at 20:22

Monday, Jan 03, 2011 at 20:22
Thanks for the advice guys i have checked all of the above repacked with grease couple weeks ago .
today rhand was not spinning as freely as left ,dismantled and made sure plunger free was a litte sticky .
me thinking on the lines of brake use will test again tomorro.
regards Garny
FollowupID: 712519

Follow Up By: AGNI4x4 - Monday, Jan 03, 2011 at 20:33

Monday, Jan 03, 2011 at 20:33
Garny make sure caliper is free on the caliper slides and also that piston can be moved freely . Push it back a little and check rotor rotates freely then apply brakes hard and check that wheel can still be turned just as free as before doing so. It's only the distortion of the caliper seal from square (not dust cover) that creates the brake clearance as it resumes it's correct shape. If seal is a little old or pistons have rust spots this can cause piston to not retract and hence loss of clearance when brakes are let off and causes friction/heat build up.
FollowupID: 712524

Follow Up By: AGNI4x4 - Monday, Jan 03, 2011 at 20:34

Monday, Jan 03, 2011 at 20:34
Note caliper seal should read piston seal
FollowupID: 712525

Reply By: Member - Duncs - Monday, Jan 03, 2011 at 21:35

Monday, Jan 03, 2011 at 21:35

The others have covered a lot of the potential problems.

One more thing to check. If the master cylinder is overful of brake fluid this can cause the brakes to drag increasingly the further you drive. When I discovered this problem the drag was so great as to be causeing the car to slow.

What seemed to be happening to mine was as the brakes dragged this generated heat which caused the brake fluid to expand. With no where to go because the cylinder was too full this pushed the pads more firmly against the disc exagerating the problem. As I said earlier in my case this got so bad that I could smell the brakes overheating. It was also causing a loss of performance.

The problem was solved by draining a bit of fluid out of the master cylinder. Keep it below the MAX line.

AnswerID: 440615

Reply By: garny - Saturday, Jan 08, 2011 at 18:40

Saturday, Jan 08, 2011 at 18:40
Hi all still sorting out the problem
appears to be heating up the hub itself repacked bearings however will visit my mechanic much to my distgust.
regards Garny
AnswerID: 441147

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