Mustang Hydroboost Question

[toddz69]

Do I need to split the boost to install the spring, rod and star washer? Or do you just push it in? I don't want to bend the star washer (not sure if that's the correct name).

Just push it in. A little care with the star and you’ll be fine.

Todd Z.

 

[MidwestTexan]

Thanks toddz69, it pushed right in.

One other question, I bought a Cardone #52-7360 reman HB. The return port is NOT threaded. What fitting would I use for that?

 

[pennyduke]

When i bolted up the new Master cylinder I had 1/4 inch gap between the Hydroboost and the Master Cylinder mating surfaces. So when I tightened it up it put a 1/4" preload on the Master Cylinder. Is this going to mess things up? The Master Cylinder that came with the Mustang Hydroboost had the same 1/4" gap and preload.

 

[toddz69]

Thanks toddz69, it pushed right in.

One other question, I bought a Cardone #52-7360 reman HB. The return port is NOT threaded. What fitting would I use for that?

I don't know the answer to that as I'm not as familiar with the Mustang hydroboosts but others here - Broncobowsher in particular is very knowledgeable on them.

Todd z.

 

[toddz69]

When i bolted up the new Master cylinder I had 1/4 inch gap between the Hydroboost and the Master Cylinder mating surfaces. So when I tightened it up it put a 1/4" preload on the Master Cylinder. Is this going to mess things up? The Master Cylinder that came with the Mustang Hydroboost had the same 1/4" gap and preload.

Yes - you'll find that the brakes are probably applied, at least partially, with that much preload, in my opinion. I'm surprised that it had that much preload from the factory.

The Super Duty master cylinder has about 0.015-0.020" preload in the factory configuration but the general rule of thumb with most of the setups is to have a 0.015-0.020" gap between the pushrod and the master cylinder piston to eliminate any concerns with brake drag, etc.

Todd Z.

 

[catfan]

The 1989 F150 Pickup Master Cylinder fit perfect. I only had to cut and flare one of my stock brake lines. Thanks catfan.

I'm now ready to fire this thing up. Is there any tips for Initial startup? I know that the Hydroboost is pretty dry. Should I prime it somehow? Thanks everyone

You are welcome pennyduke, glad to help.

 

[pennyduke]

Thanks for all the help guys. I'm now a member of the "KISS the Windshield Club". Best upgrade ever.

 

[dmoses42]

Pennyduke,

Did you have to trim or adjust the pushrod on your hydroboost to eliminate any preload on your master cylinder? My hydroboost is from a 1998 Mustang and I'm using the master cylinder that catfan suggested and I have the same 1/4 inch gap you spoke of. Just trying to figure out if I need to trim that rod. Thanks in advance.

 

[pennyduke]

I used 1/4" washers to make up the gap. One on each side between the Master Cylinder and the Hydroboost. It's been working perfect for a while now.

 

[SC74]

Agree. Mines been at an angle for 3+ years now with no issue.



Also running the 80's Dodge RamCharger MC. Works well. I did have to oval out the holes on the MC to fit.

I have the mustang HB but looking for the MC that fits with side brake lines. Did you have to adjust the push rod with this dodge set up or was it pretty much bolt up and go?