41 Years of Service

Username Post: Glazed rotors        (Topic#329393)
Crusty66 
"5th Year" Gold Supporting Member
Posts: 310
Crusty66
Age: 58
Loc: Albany, eNZed
Reg: 11-04-12
10-11-15 02:00 PM - Post#2581766    

I have the 65-70 Impala disc brakes with the large calipers, standard rotors & 8" double diapraghm booster.

The pads supplied with the kit seemed to overheat quickly & fade, so I fitted some Bendix MRD52S semi metallic pads.
The disc rotors have glazed badly & don't want to stop, particularly when cold.

I'm looking for suggestions please - are the pads too hard?

Or do I need to look at slotted rotors?

This is a big block car, so is heavy

Steve
1966 Caprice 396 496 496mkII TH400


 
cpptech 
Classic Performance Products "Site Sponsor"
Posts: 955
cpptech
Loc: CA. USA
Reg: 12-08-06
10-12-15 08:08 AM - Post#2581909    
    In response to Crusty66

What diameter wheels are you running on this car?

Thanks,
Aaron @ Classic Performance
800-522-5004


 
Crusty66 
"5th Year" Gold Supporting Member
Posts: 310
Crusty66
Age: 58
Loc: Albany, eNZed
Reg: 11-04-12
10-12-15 12:41 PM - Post#2581979    
    In response to cpptech

17" American racing Torque Thrust II, so plenty of ventilation

Steve
1966 Caprice 396 496 496mkII TH400


 
cpptech 
Classic Performance Products "Site Sponsor"
Posts: 955
cpptech
Loc: CA. USA
Reg: 12-08-06
10-12-15 02:15 PM - Post#2582001    
    In response to Crusty66

Bigger Wheels are a bit harder on brakes but should not glaze over. Check for pre-load on the master. Sounds like the brake stays engaged creating a lot of heat.

Thanks,
Aaron @ Classic Performance
800-522-5004


 
Crusty66 
"5th Year" Gold Supporting Member
Posts: 310
Crusty66
Age: 58
Loc: Albany, eNZed
Reg: 11-04-12
10-20-15 01:02 AM - Post#2583639    
    In response to cpptech

Ok, have had discs machined & fitted new pads.
Brakes not staying on.

The problem I have is very poor front brakes - if I brake lightly, the front brakes work after a short delay. If I brake heavily the front brakes feel like they aren't working at all - they feel the same as if they are overheated and fading even when stone cold. The pedal feels hard when this happens.

I have good vacuum as I have added a vacuum assist pump.
I have checked the proportioning valve warning switch, it is not showing a circuit.
When I brake lightly the pedal feels normal, a bit softer.
Is this a proportioning valve issue?
What do you think the problem is?

Steve
1966 Caprice 396 496 496mkII TH400


 
cpptech 
Classic Performance Products "Site Sponsor"
Posts: 955
cpptech
Loc: CA. USA
Reg: 12-08-06
10-20-15 08:41 AM - Post#2583695    
    In response to Crusty66

Please call 800-522-5004 ask for the Tech department. This may be easier over the phone rather then the forum. We will help figure out these issues.

Thanks,
Aaron @ Classic Performance
800-522-5004


 
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