haz87

Well it seems brakes on all cars really are my arch nemisis!
I really need help with this.

Right the full story:
Ive done a full re-shell. In the new car i have Rs turbo front discs and rear drums. Both drums have had BRAND new cylinders put in. The servo is a fully working one from my old car(took me ages to find a good one). The master cylinder is a 1.3 hcs cylinder. All lines are solid and not leaking at all. The vacuum line was also fully functional on the old car.

Basically my pedal will just go to the floor with a little effort EVEN when the engines off!!! Now first thought was servo so i swapped it for another good one(this one being fully working on the car i removed it from so deffo no probs with it). Again this didnt help it, so i put the new rear cylinders on and again no difference! I have used over 5 litres of brake fluid bleeding the brakes each time. I have done the 2 man method, back bleeding, and naturally leaving a nipple open for a good resovoir of fluid to gravitationally come out.
Everything i have done has had NO EFFECT what so ever in the pedal pressure! When the cars idling and if i continuously pump the brake its fluctuates the revs and sometimes even causes it to stall
I have tried two master cylinders now as well(tho only one i cud guarentee as fully working) and again no difference! I checked the vacuum line and there are a small surface slits/scratches but nothing that looks like it would actually have penetrated the wall of the line to cause a leak. The valve in the vacuum line is also working.
PLEASE SOMEONE, ANYONE throw your ideas, advice, knowledge at me! im desperate! Ive had a lot of problems with brakes but none that havent been fixed by replacing everything

Many thanx, a very wound up and stressed out Harry

filthyrichie

are the shoes adjusted correctly i.e close to the drum?and have you tried isolating each flexi or flexis in pairs to see if that holds pressure.....try locking them with clamps or grips

chris

haz87

ive slackened the rear shoes off quite a bit and the handbrakes near vertical now. Ill re-adjust tomorow but tbh when i did have it all nice n tight it was still in the same situation

cossiemen

1.3 hcs mastercylinder isn't up for the job mate, you need something more powerfull.

regards

filthyrichie

if shoes are slack they may need to be pumped out to take up distance try adjusting those but i agree u shud have the correct master cylinder on for the vehicle

Al Bags

You're not helping him, guys ... The Master cylinder will be fine .. There is about 2mm bore difference between the smallest and largest. (In fact, I had a 1986 1.3 OHV M Cyl working on a system with big rear shoes and Cosworth fronts, no problem .. until I knackered the Master Cyl bleeding them up later) Nothing to do with the power of it.
There is something major wrong with what he has done somewhere.
Make sure the brakes are adjusted up properly. Sure front calipers are correctly fitted?

Al.

Al Bags

I am sure it will be one of three things ...

Master Cylinder knackered.
Air in System somewhere.
Brakes not adjusted up properly (rear shoes backed right off or incorrect shoes)

haz87

Thanx for all your replies
The front callipers/pads/discs are all fitted spot on.
The rear shoes do need adjusting so ill definitly get that sorted. Ill go out and get a new master cylinder tomorow and a vacuum pipe for good will, then that will be everything brand new except for the servo, but i know its definitly working as it was fine on the car it got removed from.
Ill let you know how i get on