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Old 07-23-2013, 12:57 PM
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GM Proportioning Valve VS APV?

OK... Ive got a newly aquired 37 chevy coupe streetrod that wont stop for crap...

Ive bought a new: Vette Master cylinder, remote resivoir and 7" dual booster.

The car has a GM proportioning valve...

Should I toss this and go get an Adjustable Proportioning Valve?

This is all under floor boards of a channeled coupe.. out of sight... so no worries about cosmetics.. I just need the car to STOP!!!
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Old 07-23-2013, 01:01 PM
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Is it a 4 wheel disc set up or disc and drum?

Ray
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Old 07-23-2013, 01:17 PM
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Mustang II disc front and 89 S-10 Posi drum rear...

These assemblies appear to be fresh and in fine shape.........

Coupe was built in mid or late 90s...

It was converted from a Gasser...

Coupe has 35,000 on VDO odometer so these brakes must have worked... but I just dont like the looks of this master cyliner and booster.. so they are coming out!
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Old 07-23-2013, 01:41 PM
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If your going to replace the master and the booster, that would be time to get the correct information on which proportioning valve you need to use. If you stay with disc and drum, an adjustable proportioning valve could very well be your answer, however, without knowing what your going to replace the existing equipment with, it's a little difficult to give you a definitive part number.

Hope this helps and wish I could say more.

Ray
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Old 07-23-2013, 02:36 PM
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Bought from racingtrack23rd_performance on EBAY:

1" Bore 4 Port GM Corvette Master Cylinder & 7" Dual Diaphragm Brake Booster

Master Cylinder
This item is suitable for most GM Corvette. It is 9/16" and 1/2" ports on both sides of the master cylinder ,4 port unit,so you can mount your lines on either side,with 3/8" fitting.The plugs are apply to block the portsis high performance, cast iron coated body,dual ball zinc cap, with a 1" bore.
It is perfect for any drum/drum, disc/drum or disc/disc setup

Brake Booster
It is 7 inches Zinc Finish Dual Diaphragm brake booster. It also offers about 20% - 27% more stopping power. Standard 2 bolt brake master cylinder on top.
Has 4 bolts on bottom that mount to the firewall with 3 3/8" spacing.

Car is a 1937 Chevrolet Coupe.

Basic 350/350, vortec heads, A/C, etc.......... normal streetrod.

Original frame, tubbed 2 1/2" each side in rear with 1989 S-10 posi rear.
Brakes appear to be freshly rebuilt and clean.

Front is typical Mustang II disc suspension.

Body, doors, hood sides, grille shell and running boards are steel.

Hood top, trunk lid and all 4 fenders are glass.

What Im thinking is that the existing GM proportioning valve.. whatever its from... Nova, Camaro, S-10 or whatever... GM set it up for a specific weight etc vehicle... surely not a 37 Chevy coupe....

So with an APV I can play with it and get the disc to engage a hair before the rears... isnt that the ideal?????????
Craig
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Old 07-23-2013, 04:41 PM
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ok, I did a few google searches...
the proportioning valve on the coupe fits:
73-80 Chevy/GMC Full Size Truck Front Disc/ Rear Drums

I would think if I was going to use one of these... one from a 70s Nova or Camaro would be closer to weight etc?
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Old 07-24-2013, 09:22 AM
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I know most streetrods run the adjustable valves.. but now I see that they are not DOT approved and are "race only"....

Would it be better to use a GM model off a early Camaro/Nova?
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Old 07-24-2013, 09:49 AM
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I've done more than several brake systems in my time. When I source parts I have made sure that all the parts are compatible by getting the supplier to recommend and guarantee that everything will work well together. In a case like this where the parts where purchased on Ebay, it will be difficult to get that recommendation and things do, for the most part become trial and error.

I feel that your rationale is sound....using a PV from a Nova or Camaro....the proof will be in actually setting it up. Lately everything I have built in the last 10 years has been Disc/Disc, and GM makes a specific PV for that set up that has worked well.

Hope fully someone can chime in with a definitive part to help, if not, as I mentioned, your rationale does seem sound.

Ray
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Old 07-24-2013, 10:13 AM
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I just ran a test light to the terminal at the top of the PV and I get light.... so if it was in a "proper" car the brake failure light would be on on the dash....

This is an old gasser converted to steetrod, the builder is dead and I can see its been through more than one setup on the brakes.

The brakes themselves look fine and ready... its the MC and booster and PV under the floor that just seem to be crap...LOL

I thought Id find GM PV ratings... but seems everyone just list universal GM type valve for all streetrods... I was looking for front to rear weights... course I dont know mine anyways...

Back to garage... see I should crack a front and rear to see which way this PV is stuck... to get it reset...
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Old 07-24-2013, 11:56 AM
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If tire diameter front to rear are different size (not the width ) a adjustable would probably be a better choice since the factory gm is set for same size tires diameter also a disc and a disc/drum setup are different,on our dirt track cars we have an adjustable unit that is controlled from drivers seat ,mounted in floor beside seat.

I know I will have many post telling how they and many buddies ran a certain type and I am wrong , Just my 2 cents worth
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Old 07-24-2013, 12:34 PM
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typical streetrod big and littles.

Rears are P275/60R15 approx 27" tall

Fronts are P185/70R14 approx 24" tall
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Old 07-24-2013, 01:32 PM
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My opinion you will need an adjustable valve as the front does approx. 60=70 % of the braking you should be able to dial it in with controller,,the difference in tire diameter is kinda like tighten a bolt with a 6 in ratchet get it as tight as you can then get a 9 in rattchet see how much more it will tighten,kind of same principle with the taller tire = more leverage requiring more line pressure to stop also Disc brake retain a slight pressure as drum do not which I run a residual valve and a propostiong valve.,,

the valve I run has a twist knob and a flip lever ,the twist adjust pressere front to rear ,,on mine the flip cuts off brakes front to left or cuts off rear flip to the right,,this is to apply brakes where needed to set up the position of the car for the turn not a good idea on street,,
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Old 07-24-2013, 01:38 PM
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Car already has the 2 and 10 lb residual valves.. they will be retained......

I just want to drive safely...LOL
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Old 07-24-2013, 01:49 PM
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yea the valve I am using is on a Late model Modified dirt car it is not what you need,,just a simple twist to adjust knob
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