99 super duty hydroboost question

Post by **trei75bronco** » Thu Sep 10, 2015 7:10 am

I found a booster and i have all my fittings too. Question i have is this. I want to mount directly to firewall. Anyone done this?

Post by **trei75bronco** » Thu Sep 10, 2015 8:20 am

Also on the super duty master cylinder does it matter which port goes to front or rear brakes? The mc seems to be the same size reservoirs

Post by **Gunnibronco** » Thu Sep 10, 2015 10:53 am

I haven't seen the Superduty h-boost up close, so I don't know how it would bolt to the firewall. My Mustang h-boost does. Will the m/c reservoirs clear the hood?

I was given bad advice at one time and started messing with front/rear m/c connections. I believe all m/c use the port closest to the firewall as the front brakes, and the port furthest from the firewall (closest to the grill) as the rear. It matters because the m/c will apply pressure to the front brakes before the rears (or so I was told). I looked at a bunch of cars as they went through our body shop, and all the info I read confirmed.

Post by **crawlercreations** » Thu Sep 10, 2015 11:22 am

Rear port goes to the front brakes and the front port goes to the rear brakes. Was the superduty rear disc or drum? If drum and you're still drum you'll be okay, if disc and you're drum you'll have a slight issue with the rear brakes never being able to be pumped up. If it was drum and you have disc you'll need to pull the residual pressure valve before installing otherwise your rear brakes will drag and heat up quickly. I can't help with the mounting of the booster as I have never dealt with it. I can say you will likely be messing with the pedal pushrod length to make sure the brakes fully release and you can bleed the system.

Post by **trei75bronco** » Thu Sep 10, 2015 11:57 am

Disc disc and im disc disc. I saw this thats why I asked

Post by **crawlercreations** » Thu Sep 10, 2015 12:16 pm

trei75bronco wrote:Disc disc and im disc disc. I saw this thats why I asked

That image is inaccurate for brake line routing. Not sure what they were trying to accomplish but there is no way I would run it that way.

Post by **trei75bronco** » Thu Sep 10, 2015 3:27 pm

Im going to try my Lincoln mark v mc. Iy bolts right up and has the correct rod length.

Post by **landshark** » Thu Sep 10, 2015 3:30 pm

Oh great my hydroboost setup the rear port goes to the rear brakes and front one front. I haven't noticed any real issues but doesn't mean it couldn't be biased as I have a proportion valve for the rear. Did it really matter?

Post by **Gunnibronco** » Thu Sep 10, 2015 4:10 pm

landshark wrote:Oh great my hydroboost setup the rear port goes to the rear brakes and front one front. I haven't noticed any real issues but doesn't mean it couldn't be biased as I have a proportion valve for the rear. Did it really matter?

When I plumbed it backwards, I had tons of rear bias. I put a proportioning valve in, but could not pull the bias forward. When plumbed correct, I don't use the proportioning valve & have good bias. The person giving me the bad advice was running plumbed backwards but didn't "notice any real issues" either.

Post by **Viperwolf1** » Thu Sep 10, 2015 7:45 pm

landshark wrote:Oh great my hydroboost setup the rear port goes to the rear brakes and front one front. I haven't noticed any real issues but doesn't mean it couldn't be biased as I have a proportion valve for the rear. Did it really matter?

There are a few master cylinders that are front port/front brakes. The old corvette master is like that.

Post by **Viperwolf1** » Thu Sep 10, 2015 7:59 pm

trei75bronco wrote:I found a booster and i have all my fittings too. Question i have is this. I want to mount directly to firewall. Anyone done this?

Both mine are mounted directly to the firewall. You will probably need to clock the hydroboost some amount to clear the valve cover and steering column. When this is needed you will probably also have to make an adapter plate to mount the master cylinder. Then you probably will need to use a longer pushrod in the hydroboost to make up for the adapter length, or use a different master cylinder with a shorter pushrod hole. Other than that it's a piece of cake.

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