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I'd like to get some opinions from people who have upgraded to 1LE brakes or better as far as brake 'feel'. So far, the car has this for a brake system:
(1987 IROC)
-1LE front calipers/discs/brake lines (new)
-1LE proportioning valve as indicated for a 1987 car in all of the guides.(new)
-standard master cylinder disc/drum(new)
-rear 93-97 camaro brakes (equivalent to 89-up 3rd gen brakes) used, low mileage.
-low mileage booster (less than 11K miles), swapped to try and diagnose this issue.
so the bottom line is that the system works well, and the car stops rather quickly when above 20mph or so.....but when it gets closer to low speeds, the 'feel' is very hard. very hard, in fact, I cannot get the brakes to lock up at all. It almost feels like I lost vacuum to the booster, if you know what that feels like.
I basically think its one of two things: the prop valve is just not right. its 'right' as far as the car is concerned, but these cars just never had a 'good' valve.
the master cylinder is just the regular one, and due to the bore size, it just can't generate enough system pressure.
I see people hinting at this kind of 'feel' (I think), and I've never seen a decisive solution.
The prop valve shouldn't affect your fronts locking up. Are you sure you got all the air out of the system? Does your engine have adequate vacuum at idle to operate the booster?
yep, the brakes aren't spongy at all, I'm sure there is no air. The engine is a rebuilt 350, with a zz4 cam. Can't say I measured the engine vaccuum lately, but it seems to have enough. Especially since when you are braking, the engine should be in decel and have good vaccuum against the closed throttle blades. I could be wrong however.....
what kind of pads are you useing when i 1st upgraded to the c4 brakes almost the same as 1le i used the cheap pads they seem to hook much better at overall but they turn the wheels black in about 3 days of driveing
but the ceramic pads dont dust much but seem to lack the low speed grab everyone is used to
but i have also noticed i cant lock up the brakes as easily with the ceramic pad then with the semi-metallic
if your pedel feels a little hard ive noticed thats normal with this setup
the vacume canister "orb of power" has nothing to do with the brake booster its directly connected to the manifold
the canister is ment for heater vents and other things
it seems everyone that dose a brake upgrade has some minor issue after but then again even with all the issues ive had i still stop better then with the stock brakes
as for wheel locking my car stock would lock the fronts with ease
my fathers iroc will lock its rear drums before locking the fronts but only has 27k miles on it
my car with the c4 fronts and drum rear would lock the fronts with a double pump
my car with c4 fronts and pbr rears stops evenly very hard to lock up but stops on a dime
a double pump unleashes a fury of wheel locking grip from all 4 corners lol
but also it will lock the fronts if i do a hard fast stop from above 60 but only locks the last 10 feet
but im useing the stock master cly and prop valve
Last edited by Azrael91966669; 07-05-2007 at 03:13 PM.
