Bleeding Brake Issue

[erbs 42 1 Cars]

Ok here is what i have done

 

Replaced MC

Replaced all the pipes and flexi's for brand new

Replaced Rear brake cylinders and new shoes

Used 306 calipers on the front with new pads

 

Brakes feel spongy, bled so many times now,not sure if the front calipers are an issue

 

any help please??

[welshpug 1,655]

have you adjusted up the shoes?

[erbs 42 1 Cars]

yes coz when i put a lot of effort in pushing the pedal the rears lock up, i was thinking maybe the 306 calipers have a bigger piston size and and can cause not enough push

[erbs 42 1 Cars]

can air get trapped in the compensator?

[welshpug 1,655]

could be knackered compensator.

[erbs 42 1 Cars]

updated

 

Just been to my garage to try and find what the prob is

 

what i have done is run the engine and one foot is hard pressed on the brake and the other revving

 

what happens when i do this i feel a dip in the brake pedal once revving, any advice will be very helpful

 

also discovered why the speedo did not work too, was not seated properly in the gearbox

 

i managed to fix something today

Edited January 11, 2015 by erbs

[Slo 283 1 Cars]

are you using one of those gunson bleed kits? It's the only thing that would bleed mine properly. spongy=trapped air in the system

[2-Pugs 57]

Have you checked for leaks from any of the joins or unions?

[erbs 42 1 Cars]

i used a bleed kit but now everytime i try and use it, it pops off the reservoir, it maybe just air in their still as it was a complete rebuild of the brake system

yes i have, got no leaks anywhere,still the same amount of fluid and their is no loss, just seems a little odd.

[Mattr5uk 20 5 Cars]

Have you tried cracking off the unions on the master cylinder and checking there's no air trapped there? The vw/skoda/audi suffer with air getting trapped there but they have a bleed nipple fitted to the master cylinder.

[erbs 42 1 Cars]

funny enough i did that today, only a bit of air came out of the redundent union, still no change thou, must be more in there somewhere

Edited January 11, 2015 by erbs

[Plumbob 66 1 Cars]

I used an ez bleed only today on my car and it was fine. I only put 15 psi in the tyre rather than 20 as you could "just" hear a tiny bit of leakage on the reservoir adaptor cap when it was 20 psi. It worked perfect, went round the car twice.

 

It wouldn't be anything to do with having the handbrake on when you're bleeding would it? not 100% sure if it would make a difference for you? For drums maybe not...

[Anthony 1,002]

Are you sure its not just the rear wheel self adjusters playing silly games as Welshpug implied earlier? Very common and gives a rubbish pedal with too much travel no matter how much you bleed it as you're having to take up the slack with the first part of the pedal travel.

[welshpug 1,655]

spot on Anthony, I'd start there, slacken the cables right off, adjust the shoes up till they just rub then try again.

[erbs 42 1 Cars]

thanks fellas will check that on the drums

[erbs 42 1 Cars]

Another update

 

Sorted!!!!

 

the rears needed adjusting by quite a bit,now when i start the car up there is minimal travel in the pedal

 

and all the brakes work equally

 

Thanks guys