Brakes dragging!

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Not-a-Number
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Brakes dragging!

Post by Not-a-Number » Mon Sep 12, 2016 7:58 am

So ive got cortina drums on the back. Triumph Herald uprights and calipers with cortina hubs/discs.

Ive had this problem for ages where if I adjust the manual adjustment on the drum brake too tight the brakes work fine for a while then start to drag. I get the same thing if I put the handbrake on and then pump the brake a couple times.

Basically the pedal pumps up and then the brake comes on harder and harder to a point where it would almost completely lock up.

So my solution has been to never use the hand brake and also adjust the rear brake so I dont get the problem.

Issue Ive got now is it just started to drag after its been working fine for months. Ive backed off the rear a bit which fixed it for a day but now its dragging again.

Wondering if the master cylinder causes this?

bzrse7en
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Re: Brakes dragging!

Post by bzrse7en » Mon Sep 12, 2016 11:04 am

Yes, MC can cause this, has it got some freeplay? The reservoir port should be open to the system.

SR Components
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Re: Brakes dragging!

Post by SR Components » Mon Sep 12, 2016 7:54 pm

What master do you have......

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Not-a-Number
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Re: Brakes dragging!

Post by Not-a-Number » Mon Sep 12, 2016 8:41 pm

Not sure. Cortina?

Oil is a bit dirty. Does that indicate seals a falling apart?

Image

SR Components
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Re: Brakes dragging!

Post by SR Components » Mon Sep 12, 2016 8:55 pm

PM me your number and I'll call you tomorrow. Cant be bothered to write a long story!

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davew
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Re: Brakes dragging!

Post by davew » Mon Sep 12, 2016 11:30 pm

All you need to do is adjust the push rod going into the MC. Typically you need 1mm of free play on the push rod before it contacts the internal piston. You may also need a stronger pedal return spring. Dave W

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silvo
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Re: Brakes dragging!

Post by silvo » Mon Oct 10, 2016 8:18 am

I had a similar problem with rear shoes dragging on my mark I escort rear axle - turned out to be the rear brake cylinders should slide freely but the handbrake pivot pin had over the years worn a groove into the back plate so the brake cylinder wanted to stay in one position rather than slide freely. I had to remove the brake slave cylinders and weld / grind the backplate flat to cure it. Found the problem only when I removed the rear cylinders to replace them . Though I'm not sure if the set up is the same for the cortina rear brakes? - cheers Neil

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