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Old 01-19-2006, 10:58   #1 (permalink)
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Brakes grabbing

Hi everyone, I have a 1995 EF Falcon and I've got this annoying problem where it feels like the brakes are grabbing.
I couldn't get them skimmed because they were at minimum thickness, so new discs were put on, but the problem hasn't gone away.
Unless one of the new discs is also slightly warped in the exact same way ( unlikely), I'm not sure what can cause it.
Any ideas or comments will be much appreciated
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Old 01-19-2006, 16:06   #2 (permalink)
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Re: Brakes grabbing

What do you mean by grabbing? Explain what happens exactly.
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Old 01-19-2006, 20:12   #3 (permalink)
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Re: Brakes grabbing

If I am doing 100kmh and stand on the brakes quite hard, the car still brakes rapidly, but there is a horrible shudder/vibration.

When I am going 50 - 60kmh and brake gently to a stop, it is a lot milder, but feels more like the pads are grabbing one of the discs hard at the same spot everytime. Much like if you have a slightly bent disc, as the bent part of the disc goes between the pads, it pushes the pads apart (or tries to) and feels like it is grabbing harder.

Hope this makes things more clear.
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Old 01-19-2006, 21:57   #4 (permalink)
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Re: Brakes grabbing

Did you change all the rotors, or just the front? The rears can cause shudder as well.
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Old 01-20-2006, 13:29   #5 (permalink)
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Re: Brakes grabbing

same answer as 351 ( brake shudder is caused by excessive run out ) & may be moor noticable when hot check the run out on ur rear disks
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Old 01-21-2006, 23:17   #6 (permalink)
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Re: Brakes grabbing

Brake shudder can be caused by loose wheel bearings.........check pre-load on fronts and condition of rears.
Cheers.
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Old 01-22-2006, 11:07   #7 (permalink)
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Re: Brakes grabbing

Thanks guys.

I have new rotors all round, but I was wondering about the wheel bearings because I couldn't think of anything else that might cause it, other than the obvious one being the rotors.
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Old 02-01-2006, 11:04   #8 (permalink)
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Re: Brakes grabbing

I have found out what was making my brakes feel like they were grabbing / shuddering. Just had an LSD installed and it turns out that a previous owner has managed to kerb the car and the left rear axle is slightly bent. With the back end off the ground and the car in first, you can just notice the rim wobble.
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Old 02-01-2006, 16:37   #9 (permalink)
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Re: Brakes grabbing

Also see my post regarding wheel shimmy when hot and check your intermediate steering column universal joint for looseness.
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Old 02-01-2006, 19:08   #10 (permalink)
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Re: Brakes grabbing

Cheers Aussieblue. Will do that as well, so I can eliminate all (most?) squeaks, bumps and rattles / wobbles.
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