Thread: LRA Hydroboost Brake Upgrade Kit - replacement for vacuum pump assisted brakes

Hi, I have a 6x6 civilian that I have fitted discs to the rear which has certainly improved the brakes. I was looking at getting the master cylinder reconditioned as well as the vacuum side of things. Then along came hydroboost which I had never heard of & does not seem to be well known. So will fitting one be a better way to go? The steering pump is gear driven so a good start. What pump would I use for 6 calipers?

Thank you Paul.

youd use the same one as the 4x4 version.

as you have no ABS to worry about the 6x6 is an ideal candidate for hydroboost so long as the powersteering box doesnt leak out on you.

I'd reccomend fitting a larger accumulator and reservoir

A thread revival. to those that fitted Hydroboost brakes can i ask some Q's

1) how did you connect the hydroboost rod to the brake pedal. Some seem to have a single eyelet for a clevis pin and others a U shaped end. Is 1 style preferable to the other. any tips and suggestions for ideal location to connect to brake pedal arm? Any mods to firewall or other bits under the dash that i need to think about? pics of the pedal connection would be a treat.

2) the GM hydrobooster is ideal between 1300 and 1600 psi. Not sure what PSI is the LR power steering pump but the power steering box is 900 to 1000 psi. Did people find the LR PSP adequate for the brakes. I'm doing a GM truck 6.0L conversion. The GM PSP is about 1450 psi so have 2 options. change the internal restrictor in the pump to 1000 psi (PSC motorsport sell a replacement internal valve) or use a Heidts style adjustable relief valve inline between the hydroboost and PSB.

3) for a D130 that is often loaded heavy, should i stick to the 1-1/8 master cylinder bore that is standard on the GM trucks. I assume yes as my kerb weight is comparable to the tare of a silverado 2500HD.

4) is heat a problem that i should plan on a cooler in the system.

many thanks in advance