How to: NBS master cylinder swap for firm brake pedal

[bluex]

One would think that using an 800 25/3500 master on the hydraboost should work in theory

If you read the link about the hydroboost you would see that the master has a slightly larger diamater than the bore in the hydrobooster itself. It says the master is .2" bigger than the booster. Since modifing the booster causes the washer/pushrod assembly to be loose, I wonder if you could take that .2" off the master instead?


Edit: I also just looked up a master for all 2002 model trucks and the hydroboost master is the same part number for 1500/2500/3500 with a gas engine anyways.

 

[DRAGGIN95]

Yeah the NBS hydroboost unit will accept the larger OD bore MC unlike the obs unit, I actually bought a NBS Hydroboost unit, and aside from modding the firewall to make it fit which I did not want to do there is no easy way to do it.

 

[DRAGGIN95]

Can a moderator move this to the axle/brakes subforum?

Done!

 

[eric.s.t]

The guy on FSC seems to have done it no problem... i think im gonna go ahead and try to put the hydroboost on the MC of a NBS... im this far into my truck now lol

 

[bluex]

The guy on FSC seems to have done it no problem... i think im gonna go ahead and try to put the hydroboost on the MC of a NBS... im this far into my truck now lol

Ya I'm just not a fan of modifying a $200+ booster. Id rather try it on a $50 master I might go grab one from the yard an see if there is enough material to modify the master. Or maybe try taking .1" off each

 

[88GMCtruck]

I've noticed, 94+ ABS equipped trucks seem to have the soft pedal problem. I know my 88 (and the other RWAL trucks I've driven) have some of the stiffest pedals on earth. I know my truck has always taken a strong right leg.

 

[eric.s.t]

you can always just get the machine shop to do it... if it works, the guy has proff of it working, what's their to lose?

 

[TylerZ281500]

I've noticed, 94+ ABS equipped trucks seem to have the soft pedal problem. I know my 88 (and the other RWAL trucks I've driven) have some of the stiffest pedals on earth. I know my truck has always taken a strong right leg.

i second this, my 88 had a super firm pedal after it was bled properly my friend 98 on the other hand is softer that a marhmellow peep.

 

[Half Assed]

Done!

thanks bud

 

[TylerZ281500]

so can one change out to a nbs master hydro unit and pedal and then obs lines, pump etc. ?