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Old September 23rd 2005, 05:34
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65Cabby 65Cabby is offline
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Vaccum Assisted brakes

I have a question on the vacuum pressure required for a servo assisted brake system.
I'm fitting a 944 master cylinder and booster but am pondering the method how to get the vacuum to it.

Should I tap each of my inlet manifolds to even out the pulsing cycle? , will I need a one way valve? Or do I go for an electric pump??

Just out of interest as I've never looked at a scooby engine that would originally have a vacuum system, are they always single induction bodies with one vacuum pipe or do some have twin setups.

Thanks
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Old September 23rd 2005, 05:49
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DORIGTT DORIGTT is offline
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I'd think a one-way check valve and used vacuum reservoir from a wreck would work.
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Old September 23rd 2005, 10:15
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I remember the good old days when it took a real man to drive a car. You had a big ol' 6000lb piece of Detroit's finest. The big block engine weighed heavily on the manual worm-and roller steering system, the straight master cylinder hooked up to four wheel drums. The clutch linked via a rusty cable to heavy clutch. Yes, the good ol' days when driving was a 'sport'. Physical fitness was a requirement, and your daily workout was the drive. These days we have these power-everything featherweights that can lock the brakes with the merely a touch of the pedal, that you can operate the clutch with your pinky toe and that can be steered with your one finger.

Kidding aside, what brakes are you running that justify a booster?

Lanner
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Old September 23rd 2005, 11:52
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65Cabby 65Cabby is offline
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I've taken on a project that already had the 944 master cylinder fitted so I'm not sure I can justify it myself. From what I've been reading fitting brembo's doesn't even need a larger master cylinder let alone a vacuum booster / servo. Although the feel as you say is going to be nice and soft (for when the misses drives the car)

I have vented disks and 968 callipers all round.

After DORIGTT's post I've been looking at vacuum reservoirs but they only seam to sell in the US, I've not heard of them being fitted to european cars other than big 4x4's
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Old September 23rd 2005, 22:40
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lazylongboarder lazylongboarder is offline
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...POWER BRAKES :raiseroof




Thanks Lanner
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1974 type 1
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Old September 23rd 2005, 22:47
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lazylongboarder lazylongboarder is offline
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Big *** Master

Pardon my french but all you need is a Big *** master cylinder. Wilwood makes a 5/8'',3/4'',7/8'', and 1'' master that'll push my 6 pots at all corners with out having the "detroit muscle real man brakes'' feel. If I wanted that I would've put dump truck drums at all corners... I thought my brakes were big until I saw drums so large the rims must be 22.5''s. Commercial only and I think you would need 2000 hp to spin them let alone fit the damn things.

Save yourself the headache and talk to Lanner@vdubcustoms.com. He does this for a living, he knows what he is talking about.

Nice brakes by the way.

Russ

If people from Utah are called "Utahn's"...What are people from Tampa called?
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1974 type 1
Turbo 6 piston brakes at all corners
Project is taking all my money and it's all Germanlook.com's fault!

98' Audi A4
93' T-Bird (oh yeah!)
90' 911 C2
74' beetle
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  #7  
Old September 24th 2005, 03:30
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volkdent volkdent is offline
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Hey Lazy, how's the pedal feel on your brakes?

Jason
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Old September 24th 2005, 16:11
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65Cabby 65Cabby is offline
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You'll love this, not only will I not need big thighs for the brakes, I've also got a hydraulic clutch.
I'll save my strength for a strong right foot on the accelerator pedal. [translation:gas peddle]
Any one would think I was building this for the wife. She has already refered to the car as my misstress so I might have to keep them apart

Thanks for the pointer to vdubcustoms, I had seen their web site but I didn't want to bother someone I wasn't buying from, but I give him a try.

The engine is being dyno's so I'll have to see how the 'feel' is, I used to race in the UK Beetle Cup series so I know what a feel means and what you get from it when near the limit. That and brake fade! Which is one thing I'm not going to get.

I've got some 17x7" CupII's that look the dogs danglies but if I didn't have lowered spindles I would still be able to get a 14" Fuch on the hub. I offered up a set I've got in the garage just to see the look.

Having a chat elsewhere and my view now is that I will probably only need a one way valve. I can always add either a vacuum reservoir or electric pump later.
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Old September 25th 2005, 04:33
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Do you have some pictures of your pedal set-up you could share? I'm looking at a G50 and will need a hydraulic clutch
Cheers, Rich

Quote:
Originally Posted by 65Cabby
You'll love this, not only will I not need big thighs for the brakes, I've also got a hydraulic clutch.
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Old September 25th 2005, 14:35
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Yes, pics please.

Jason
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Oval Ragster-'57 Rag/'04 Boxster S
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  #11  
Old June 23rd 2006, 19:17
adaptorman adaptorman is offline
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Exclamation brake disc problem(sorry to add )pic included

ive a 71 bug disc spindles ,and i need a hub (not hub and disc as one)need a seperate hub which i can mod some bigger vented brakes to stop this t5 bug ) as id have to redrill to volvo 5stud pcd can anyone help

work has stopped on my project as i carnt find anything thats big eneogh to fit for the stud pattern and spindle size?
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  #12  
Old June 24th 2006, 02:40
alt+f4 alt+f4 is offline
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with such light cars like the bugs i would be affraid that power brakes would kill any feeling of the brakes, and with out ABS they will lock up too easy. Lao what are you doing about the pedal ratio?



I personally hate anything but power windows in a Small sporty car.

I still am Perplexed to this day why Mazda ever used power steering in the MX5.
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