Master/Booster upgrades?
#22
Boost Czar
Thread Starter
iTrader: (62)
Join Date: May 2005
Location: Chantilly, VA
Posts: 79,501
Total Cats: 4,080
I put a vacuum pump on it, and it's all over the place; highly inconsistent.
sometimes it wont pull any vacuum, other times it would pull and hold nearly the max of the unit.
one time i started the car, pumped it a bit, turned it off and tried again and it literally wouldn't pull any vacuum at all. When it does pull vacuum it seems to hold it...but other times it was leaking off ever so slightly.
I feel like it should always pull the same amount of vacuum all the time right?
sometimes it wont pull any vacuum, other times it would pull and hold nearly the max of the unit.
one time i started the car, pumped it a bit, turned it off and tried again and it literally wouldn't pull any vacuum at all. When it does pull vacuum it seems to hold it...but other times it was leaking off ever so slightly.
I feel like it should always pull the same amount of vacuum all the time right?
#24
Elite Member
iTrader: (21)
Join Date: Jun 2007
Location: Rochester, NY
Posts: 6,597
Total Cats: 1,263
I put a vacuum pump on it, and it's all over the place; highly inconsistent.
sometimes it wont pull any vacuum, other times it would pull and hold nearly the max of the unit.
one time i started the car, pumped it a bit, turned it off and tried again and it literally wouldn't pull any vacuum at all. When it does pull vacuum it seems to hold it...but other times it was leaking off ever so slightly.
I feel like it should always pull the same amount of vacuum all the time right?
sometimes it wont pull any vacuum, other times it would pull and hold nearly the max of the unit.
one time i started the car, pumped it a bit, turned it off and tried again and it literally wouldn't pull any vacuum at all. When it does pull vacuum it seems to hold it...but other times it was leaking off ever so slightly.
I feel like it should always pull the same amount of vacuum all the time right?
#29
Senior Member
iTrader: (4)
Join Date: Jan 2008
Location: Falls Church, VA
Posts: 1,361
Total Cats: 17
I snapped one while installing. Had to be an issue with the threads or the taper of the flare just not mating well with the stock lines. It just didn't seal, so I tightened it a bit at a time, and it eventually snapped. I got a replacement and used some sealant on the threads and it's been okay for 2+ years, but it's in the back of my head as a weak point and I'm still going to get some of TSE's steel fittings.
#32
Man, threads like this make me want to start a Miata wiki/FAQ etc. thing that has ALL of the information you could ever want on the NA/NB in one spot. What fits between the two, and what factory upgrades are. People that are new to Miatas might not know that they can get 1.8 brakes for their 1.6, or even Sport NB brakes as an upgrade. I didnt know until this thread that the booster/master was different as well.
#37
trying to bleed some new wilwoods with a sport booster/929 mc swap. bench bled the MC, i can bleed the rears fine, no pressure gets built up when i go to bleed the fronts though. gravity bled the two top bleeders on both sides and fluid comes out ... but no pressure after pumping up the brakes - sounds like a bad MC? unfortunately you can't buy new 929 MC's anymore. it doesn't look like i'm having luck with this reman..
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