Brake issues

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Brake issues

Postby Garreth on Mon Mar 09, 2015 12:54 pm

Ok so now I am just stuck...

My setup runs cortina calipers with discs in the front with the escort diff with drums at the back. A golf 1 master cylinder with dual pistons.

Now I had the Cortina calipers redone at CBF in Strydompark. I bought new slave cylinders for the drum brakes and there is about 8mm of pad left on the drum brake shoes. The adjuster moves out and self adjusts when the pedal is pushed.
I have bled the system until blue in the face with no air coming out.

I STILL have to pump the pedal to get the brakes to take!!!

Honestly any advice or if someone has had a similar problem please let me know
Cheers

EDIT: I think I need a residual valve (basically a non return valve up to a certain pressure), or a bigger bore master cylinder.
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Re: Brake issues

Postby davew on Mon Mar 09, 2015 5:17 pm

Garreth
If your master cylinder is mounted lower then the front calipers and wheel cylinders then you should look at getting resdual valves plumbed into the system. If the pedal is not hard, and your master cylinder is high mounted, then you probably still have air in the system. jack up the car and have someone apply the brakes then turn the wheels to see which wheels turns the easiest. Then bleed that pair of wheels. Some times you even have to remove the caliper(s) from the spindle and rotate the calpier to force the air bubble up towards the bleeder while pumping the brakes. You can also try to manually adjust the rear brake shoes, to the min clearance that will still allow you the install the drums to reduce the travel. Last you may want to try a vacuum hand pump for bleeding. Dave W
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Re: Brake issues

Postby Garreth on Mon Mar 09, 2015 6:01 pm

Hi Dave,

Yes it is lower than the slave cylinders. I have bled the system silly.
First I flushed the line with half a bottle of fluid and just pumping. Then I used the pump 5 times and then release the nipple method.
Did this several times on each wheel so I reckon there is no air.

I have adjusted the rear brakes so that I can barely get the drum back onto the diff thus reducing the space available for the pads to move.

The thing is I need to pump the brakes to get them hard but once hard there is no spongy feeling at all and the master cylinder doesn't lose pressure.

I can only think the master is not moving enough volume to off set the distance the springs retract the rear pads (even with the adjuster).
Completed 1.6L 20V ST
Designing Ariel Atom Clone
http://www.garrethslotus.tumblr.com
Garreth
 
Posts: 102
Joined: Tue Feb 21, 2012 10:19 pm
Location: Randburg, Johannesburg

Re: Brake issues

Postby Garreth on Tue Mar 10, 2015 10:09 am

So its usually the simple things...... :x

I opened up the pedal box area and through let me see what the travel is on my pedal.....

Adjusted it so the connector rod is 20mm longer....

Now she brakes like a car hitting a brick wall....

So much admin for the smallest thing...

Anyways glad its fixed, hopefully someone learns from this and doesnt battle like I did

Cheers
Completed 1.6L 20V ST
Designing Ariel Atom Clone
http://www.garrethslotus.tumblr.com
Garreth
 
Posts: 102
Joined: Tue Feb 21, 2012 10:19 pm
Location: Randburg, Johannesburg


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