Dragging disc brakes

Technical MGB discussion
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Tom Brearley
Posts: 89
Joined: Sun Apr 01, 2018 6:54 pm
Forename: Tom
Surname: Brearley
Location: Devon

Re: Dragging disc brakes

Post by Tom Brearley »

I know, it seems obvious! But they worked fine for 6 months before starting to bind up. So I want to investigate whether there's another explanation. Apart from anything else, the pads have great stopping ability and weren't cheap. The only snag is that they squeal badly so the shims (or some sort of shim) is absolutely necessary.

The binding occurs even with only the metal shims in place, which can't be right. They must be designed to fit behind a pad without compromising the system.

MG's do keep you busy! :|
1973 MGB GT
Mallard Green / Autumn Leaf
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Michael Barclay
Posts: 100
Joined: Tue Dec 06, 2016 8:05 pm
Forename: Michael
Surname: Barclay
Location: Abingdon

Re: Dragging disc brakes

Post by Michael Barclay »

Hi Tom
This must be really frustrating. Not sure if might help .i changed the discs and pads on my fiesta runabout about 6 months ago. All OK but after about 6 weeks the off side brake stated squealing under braking. I took the pads out and with a file, very lightly dressed the edges of the pads. So far no more squealing.
Best regards
Mike Barclay
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Tom Brearley
Posts: 89
Joined: Sun Apr 01, 2018 6:54 pm
Forename: Tom
Surname: Brearley
Location: Devon

Re: Dragging disc brakes

Post by Tom Brearley »

Just a quick update:
  • Pistons exercised further (no sign of any rust).
    Finished with brake cleaner; no grease.
    Rust removed from disk rims with 60grit.
    1/32” taken off the thicker N/S pad to equalize with partner.
    Rubber backings on both and small amount of copper grease.
They no longer bind but are still dragging a little. Investigations will continue!
1973 MGB GT
Mallard Green / Autumn Leaf
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