sideways braking - Team Camaro Tech
Brakes, Suspension & Steering Conversion questions, Steering & Handling

 
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post #1 of 6 (permalink) Old Mar 17th, 02, 08:18 PM Thread Starter
 
Join Date: Feb 2001
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I have a sec. gen with rear disk from a 80 transam, including the master,booster, and proportioning valve, and the stock front discs. On the back i have a new caliper on the passenger side, on rotor on the driver side isn't in great condiontion, the top is beveled and there isn't as much contact area. When i slam the brakes the rear end pitches to the right, towards the passenger side. On another post someone told me the rear shouldn't lock at all, so that should mean the car shouldn't pitch all right? This condition seems dangerous.
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post #2 of 6 (permalink) Old Mar 17th, 02, 09:17 PM
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David Pozzi
 
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Remind me not to ride with YOU! (just kidding)
The rears should only lock AFTER the fronts lock. On a hard stop the fronts might lock slightly with the rears not locking at all.

Testing should be done by coming down firmly and smoothly on the brakes. Ideally the front wheels should start to chirp like they are wanting to lock, with nothing funny happening on the rear.
If you really slam on the brakes like you are doing a stunt, all four wheels might lock.
If the rear brakes lock, the car will want to spin out, and you will be in worse trouble than plowing straight ahead with front wheels locked. The fronts do most of the work and if the rear locks first and you have to let up to keep the car going straight, you are then increasing your stopping distance.
David

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[This message has been edited by davidpozzi (edited 03-17-2002).]
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post #3 of 6 (permalink) Old Mar 18th, 02, 06:52 AM Thread Starter
 
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My honda doesn't do this, even if I lock the brakes really hard, do you think I should invest in a adjustable proportioning valve and put more on pressure on the front brakes. I will do the test and see what happens
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post #4 of 6 (permalink) Old Mar 18th, 02, 10:00 AM
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Gene
 
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I think your problem is that you have a good brake on one side and a bad one on the other. I would recommend that you replace any parts that are bad and then see if you still have the problem.

I was my understanding that the 2nd gen T/A system splits pressure 50 front/50 rear - in other words, no proportioning.
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post #5 of 6 (permalink) Old Mar 18th, 02, 06:00 PM Thread Starter
 
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Yeah, that would probably be a good idea. What does that mean about the proportioning valve.
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post #6 of 6 (permalink) Old Mar 18th, 02, 06:13 PM
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David Pozzi
 
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2nd gen TA has smaller pistons on the rear calipers to reduce rear braking.
Around 45 percent of the cars weight is on the front wheels, plus whatever transfers forward when braking hard, maybe 200 lbs from that.
So braking "power" would have to be in proportion to that "dynamic weight balance".
But on slippery surfaces there is less braking traction, so less forward weight transfer. The car would need a bit more rear brake to balance under these conditions.
Then add a full load of passengers and luggage... the need for rear brake would go up, but you can't, because the car won't balance when empty...
So, there are compromises in the factory brake system balance to prevent rear lockup in most any weather condition and load configuration.
Plus a safety margin so the rears NEVER lock first, on a production car.
David

------------------
Check my web page for First Gen Camaro suspension info:
David's Motorsports page
First Gen Suspension Page
67 RS 327 original owner. 69 Camaro Vintage Racer, 65 Lola T-70 Chev SB Can-Am Vintage Racer
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