Master Brake Cylinder

[VAN059]

Hi Everyone, hoping for some insight from this great forum  ,

My brakes let go a couple of months ago, so I have been systematically replacing all and sundry, only to find out that the rear brake line, on the diff, had worn through due to the exhaust rubbing on it 

During the course of replacing stuff, Rep co have buggered me twice  . First they gave me the wrong slave cylinders, right part number, but they don't match the originals, so they'll have to come out, then they have given me the master off a drum/drum (P5489) not disc/drum (P5491). Going by Repco's brake book the only difference is there's a valve & valve pad in the drum/drum master which isn't in the disc/drum master, everything else exactly the same. He told me to just remove them  , my question is, it's obviously there to restrict flow, but what difference will it make if I leave them in? does it affect the boost? While I enjoy being on first name basis with the staff at the Rep co store, if I didn't have to make another trip to replace the master, I'd be a happy man 

Any help appreciated.

Cheers
Marc

[mcl1959]

The valve holds pressure in the line which is good for drum brakes but bad for discs. They must be removed. Get a self tapper and start it in the brass seat, then gradually pull the seat out. The valve will then fall out. Replace the seat with a small drift.
Ken

[ACE]

G'day Marc,
Ken was giving instuctions of how to remove the valve on a dual circuit master cylinder.
If you are running front disc brakes with a P5489 single circuit master cylinder you have dismantle the cylinder by removing the circlip and piston and spring and remove the valve and valve pad at the end of the cylinder(leave the valve and valve pad out). Then reassemble with a bit of brake fluid in the cylinder and on the brake rubbers keeping everything clean.If unsure get a mechanic to check or get the correct one (P5491) from Repco.

ACE 

[VAN059]

Thanks guys,

Just wanted to double check, its fine to discuss parts with the younger Repco saleman, who may or may not have ever seen one of these, but for them to recommend removing parts, at the drop of a hat, questions get raised in my mind. 

Cheers

[FCV08]

Mark

Don't go near Repco here in Toowoomba for that exact reason.

oh and that is if they even see you walk in the store.

Luckily enough there is choice here and I use a company called Parts for Cars. Great service and they do specialise in brake parts.

Good luck

Cheers

Craig D

[VAN059]

All good 

Got a credit on the slaves, and actually put my original master back in. As I stated in my first post, the problem lied with the brake line wearing through & not the master or slaves.

It all works a treat and she's back on the road better than ever, putting a smile on my face 

Cheers