P1020508

This work guide details the upgrading of a HR drum brake front end to a HR disc brake front end. To perform this upgrade the parts you will need are:

* Disc brake stub axles (2, one from each side)

* Disc brake callipers (2, one from each side)

* New disc brake pads (4, 2 for each calliper)

* Solid brake line and flexible brake line from calliper to fitting where the drum brake flexible line ran from (Not completely necessary but less chance of the line getting “pinched” on the road by any of the suspension)

* Brake booster (VH40)

* Copper brake line from booster to master cylinder

* Steel brake line from booster to junction box (Not completely necessary if you carefully bend the current steel one and mount the booster well back like I have)

* Brake master cylinder (to suit disc brakes)

* Rear brake cylinders (disc brake HRs use different...

P1020509

Pictured is the disc brake master cylinder, as you can see they are usually well marked as “Disc Brake” whereas the original and standard brake master cylinders are just marked as “Brake”.

P1020510

These are the callipers, if you have gotten good ones like I was supplied you won’t need to have them reconditioned, if you do need or want to recondition them then please refer to my work guide on that job.

P1020511

This is the front of one of the assembled disc brake hubs, if your rotors are in bad condition then new ones are only cheap if you buy something like Protex, or more expensive if you go for the DBA product, either way they are both excellent (I used Protex on mine due to monetary constraints and have had no problems). If you do get new rotors please refer to my work guide for that job. The rotors pictured only have a little surface rust, a short drive will clean them right up, I was lucky to purchase a recently reconditioned setup.

P1020512

The rear of the assembled disc brake hub pictured above shows the disc brake stub that will fit in the place of the standard drum brake stub. This is a straight bolt in with no alterations required.

P1020513

The brake booster, required is a VH40 although I’m not sure if there is much difference between a VH40 and a VH44, either way you will need a booster for this job.