 Power assist brakes, Has anyone done it? |
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| theer |
 Mar 23 2025, 11:28 AM
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Senior Member  Group: Members Posts: 691 Joined: 31-July 15 From: Dover, MA Member No.: 19,014 Region Association: North East States 
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I Race an LS2 powered 914 and an LS1 powered 944 with a bunch of other guys. The 944 has a Ford hydro-boost system in place of the stock vacuum booster (no room with the v8). Works great, if maybe a little touchy for my taste.
The 914 has upgraded Boxster brakes, but no power assist. I like it better, but everyone else prefers the assist. Has anyone figured out a way to get power assist for 914 brakes? We are pursuing an idea to use a Tesla brake module in the front trunk, with a stock MC (cap off all but one brake line) driving a slave cylinder which activates Tesla master. Even Better would be a electro brake module that’s hydraulically activated directly from the master… We are still brainstorming, so any ideas are welcome! Thanks! |
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| technicalninja |
Mar 27 2025, 08:32 AM
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Advanced Member Group: Members Posts: 2,477 Joined: 31-January 23 From: Granbury Texas Member No.: 27,135 Region Association: Southwest Region
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Impressive fitting of a vacuum booster!
Make sure something like that will pass 'Safety/Technical inspection" for your class of racing. There is another problem with a vacuum booster that you will have to overcome. It's distant from your main vacuum source. I would use aluminum line for most of the run back to front. On an application of forced induction, you will need a fail proof check valve to keep boost out of the booster. Arnold Schwarzenegger couldn't depress the pedal under full boost. And, in both ITB and forced induction the vacuum source can be whimpy. I'd also install an "assistance" vacuum pump. Lots of options here. Many front drive 90s GM vehicles had a very workable electric vacuum pump assembly specifically for the brake booster. I'd still try the "old school" way that most posters have suggested first. You like that better anyway. What you like is the "feel" of a simple, non-assisted hydraulic system as it has more feedback. That Hydro boost in the 944 deadens this aspect a bit. If the car was "mine" I wouldn't provision it for others. Properly set up, the dual master set up should stop the car every bit as fast as a boosted set up and have less complexity making it more reliable. |
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Posts in this topic
theer Power assist brakes Mar 23 2025, 11:28 AM
technicalninja I'd look into a dedicated "race" typ... Mar 23 2025, 12:37 PM JeffBowlsby Maybe Ken Brock will respond to this thread? Mayb... Mar 23 2025, 05:59 PM Chris914n6 What he said ^^
Way easier to do the 'race... Mar 23 2025, 08:09 PM theer Thanks guys- the objective is to reduce the pedal ... Mar 24 2025, 07:27 AM
Superhawk996
Thanks guys- the objective is to reduce the pedal... Mar 24 2025, 07:39 AM
Chris914n6
Does a dual pedal system make the brake pedal “... Mar 24 2025, 08:39 PM Superhawk996 The proposal to use the stock master cylinder, the... Mar 24 2025, 07:38 AM Larry.Hubby I did add vacuum assisted brakes to my 914-6 conve... Mar 26 2025, 09:05 PM Vicious
I did add vacuum assisted brakes to my 914-6 conv... Mar 26 2025, 09:58 PM Artfrombama
I did add vacuum assisted brakes to my 914-6 conv... Mar 27 2025, 04:54 AM technicalninja Two more thoughts...
I too, prefer Tilton over Wi... Mar 27 2025, 08:46 AM Superhawk996
And this is the more telling, I've seen boo... Mar 27 2025, 09:03 AM gnomefabtech https://powerbrakes.com/pb900-universal/
https://... Mar 27 2025, 10:17 AM Chris914n6 It actually wasn't said but they are referring... Mar 27 2025, 01:54 PM Ron914
It actually wasn't said but they are referrin... Mar 27 2025, 03:32 PM Root_Werks Larry's adaption is truly impressive!
I t... Mar 27 2025, 03:28 PM |
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