GQ front wheel bearings
Submitted: Monday, Jan 03, 2011 at 18:28
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83409
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garny
Hi
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.
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.
Cheers
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
Garny
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.
Duncs
AnswerID:
440615