I put rear Disc brakes on my Brumby but I don't think the current Master Cylinder, or Servo unit are

100% up to the task when it comes to hard on emergency braking. Anyone out there who has any

info on an upgrade. Sometime back I got a Servo off a Suby Outlook, but couldnt get the  Servo

unit past the inner Strut towers.

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I did the disc brake swap on one of my wagons, and it works perfectly with the stock master cylinder and booster, easily able to lock all four wheels. 

I'm guessing the problem is you can't lock the rear wheels?  Is the pedal firm or spongy?  If spongy at all, bleed them again, should be very solid with the disc brakes.

Other problems could be bad hoses (they sometimes swell shut with age), corroded hillholder, or bad calipers.  Do you get good flow from the bleeders when bleeding then rears?

 

I’ve got rear discs on both my Brumby and L series without changing the standard system other than braided brake lines. 

The brumby is by far the vehicle with the best brakes now! The L series needs new rotors or pads after sitting around for a few years, plus it runs 27 inch diametre tyres so that takes some of the punch out of the brakes. 

If you’re running the old rubber hoses I highly recommend replacing them at the very least with new rubber hoses. Best upgrade is the braided. I had a kit for the brumby from an ADR approved kit from eBay that did all the stock hoses then the flexible line to the rear caliper made up by a local brake and clutch specialist to finish off the complete system. 

The important thing is that your fronts lock up before the rear. If you’re locking the rear up before the front I’d recommend overhauling the front brakes then looking into the front/rear brake bias if the issue persists. It’s down right dangerous to have the rear brakes lock up before the front. 

Cheers 

Bennie

Edited May 3, 2025May 3 by el_freddo
Correcting basic autocorrect mistakes

Thanks Guys .