I have tried to lock the brakes up but cannot, The pedal gets really hard to push towards the bottom. It stops OK but not that quickly. I just replaced the pads and calipers on the front and had the rotors turned. I am at a loss.
Thanks, Gary

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1990 Formula 350
13.8 @ 98 MPH 1/4

 

More than likely you have caliper(s) that are froze in the bore, or sticking at least. The rear disks (J65 option) are notorious for problems, and there are GM technical bulletins about it. AutoZone sells rebuild calipers very reasonably, so if rebuilding you own sounds like too much work, you may check into that.

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87 Formula 350 13.94@96.67
98 Z28 1LE 13.15@107.59
1LE Owners Association

 

I have not replace the rear brakes yet. So you think my problem is with the rear calipers?
Thanks

 

you don't have a problem, really. they are all like that. I can't lock mine either. your rear brakes are fine if they are 89+.

I have brand new bendix pads too. the car stops, but it will never lock them at hiway speed.

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89 Formula
96 Impala SS

 

My brakes lock up way too easily. I can sure stop quick when I have to though.