The pistons have to come out enough to give clearance for the rotor. In one of the pic's one set of pistons are out the opposite side appear to be bottomed.??
Wrong calipers?
Talking about a 77 Corvette.
The caliper is mounted too close to the rotor to the point of rubbing the back side of it. I can't quiet figure out what's off. Do I need a thinner rotor or is the wrong type of caliper being used? Check our this image:
![Automotive design Tints and shades Personal protective equipment Automotive lighting Auto part]()
From the other side
![Automotive tire Hood Automotive lighting Grey Motor vehicle]()
Here is what the caliper bracket looks like:
![Automotive design Automotive tire Auto part Automotive fuel system Personal protective equipment]()
Look at the grooves on the back of the rotor the rubbing has caused:
![Tints and shades Automotive exterior Gas Bumper Auto part]()
The pads seem fine, which I don't think should make a difference anyway.
![Automotive tire Vehicle Automotive design Rim Bumper]()
Everything appears to be nice and tight, it's as if the part of the caliper that goes between the bracket and the rotor is too thick. What am I missing here?
The caliper is mounted too close to the rotor to the point of rubbing the back side of it. I can't quiet figure out what's off. Do I need a thinner rotor or is the wrong type of caliper being used? Check our this image:
From the other side
Here is what the caliper bracket looks like:
Look at the grooves on the back of the rotor the rubbing has caused:
The pads seem fine, which I don't think should make a difference anyway.
Everything appears to be nice and tight, it's as if the part of the caliper that goes between the bracket and the rotor is too thick. What am I missing here?
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Appears to be a parts mis match.
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I was surprised to see the pistons on the outer side. Shouldn't they be on the inside? But at the same time the bleeder valve appears to be in the correct spot.
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Not knowing the history of this 45 year old car, the pix look like the rotor diameter is either too large for the caliper or if the rotor is correct, the caliper is wrong. I'm gonna guess a 12" rotor under a caliper designed for 11.75" rotors...
Russ
Russ
Should be a 4 piston caliper on a Corvette.
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Yeah looks like there are 2 pistons on each side. Makes me wonder why have pistons on the outer side where they aren't controlled by the master cylinder.
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According to this Russ is right.
disk brake rotor dimensions for C3's ??? - CorvetteForum - Chevrolet Corvette Forum Discussion
C3 General - disk brake rotor dimensions for C3's ??? - My brake supplier lists different numbers for front and rear and gave me the differences. Except for the e-brake hat, why would one be .01 bigger diameter? Front Rotor Outer Dia: 11.74 Height: 3.08 Nom Thick: 1.25 Min Thick: 1.22 Hub Reg...
www.corvetteforum.com
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292 Posts
This is interesting. However, looking at the grooves on the rotor from rubbing on the caliper, I would think the issue is with the thickness more so than the diameter of the rotor. What's the difference between nominal thickness and minimal thickness?
Internal passages in the caliper allow fluid to feed both sides simultaneously .
As to the rotor surface , how long have those rotors been in use ? That looks like wear when the pads wear out .
As to proper diameter , get out your measuring tools .
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Caliper doesn't appear centered or the wrong parts altogether. I'd buy all new ones from Rock Auto and compare old and new. Rock Auto also has pretty good pictures on most things.
Four piston calipers are rigidly fixed and the pistons on either side make up the pad wear compensation. Unlike a 2 piston caliper that floats back and forth as needed.
Four piston calipers are rigidly fixed and the pistons on either side make up the pad wear compensation. Unlike a 2 piston caliper that floats back and forth as needed.
1977 CHEVROLET CORVETTE 5.7L 350cid V8 Caliper | RockAuto
RockAuto ships auto parts and body parts from over 300 manufacturers to customers' doors worldwide, all at warehouse prices. Easy to use parts catalog.
www.rockauto.com
1977 CHEVROLET CORVETTE 5.7L 350cid V8 Rotor | RockAuto
RockAuto ships auto parts and body parts from over 300 manufacturers to customers' doors worldwide, all at warehouse prices. Easy to use parts catalog.
www.rockauto.com
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Caliper is not centeted on the rotor. Compare it to the opposite side how it mounts. Look at each caliper half.
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292 Posts
It could also be rear rotors on the front. That rotor looks wrong offset and too thin, based on how much piston is showing on the outside with what appear to be brand new pads. With new pads, both sides will have the pistons just about fully retracted.
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