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Old Jul 15, 2019 | 11:35 AM
  #41  
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Originally Posted by Fredtoo
If the master is too big, it will give a really firm pedal, but not much stopping power, unless you have REALLY strong legs.

The correct master, along with high friction pads, will get you stopped.
I have a 1 inch bore master on the way. What pads for good grip would you recommend?
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Old Jul 15, 2019 | 12:27 PM
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That question should open a can of worms......

I went for the Raybestos pads here.
https://www.rockauto.com/en/catalog/...brake+pad,1684

They have good bite for a modest cost differential.
They were definitely stronger than the pads that came pre-loaded in a rebuilt caliper.

I would be interested in how they compare to an 'autocross" pad from a different source if anyone has that data.
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Old Jul 15, 2019 | 01:08 PM
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The question isn't what pad someone else uses, or what pad works best for all around use. The question is what pad has MORE bite. Every different pad has it specific use, but it should be cut and dried what has the best bite.
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Old Jul 15, 2019 | 01:50 PM
  #44  
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I agree with FredToo about a can of worms.

kodpkd: Asking a limited population of people who are still following this post what pads they like best isn't necessarily going to get you to what you like best. There is lots of data. as I am sure you well know, available. Here is one such set. Notice that some have to get pretty hot to start gripping well. My suggestion at this point is head off into the outside world and pick out something for yourself. I've used Hawk for years, here is data on how their various pad compounds perform.


Last edited by ignatz; Jul 15, 2019 at 01:52 PM.
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Old Jul 18, 2019 | 09:32 AM
  #45  
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After measuring the master on my car. Finding it was a 1 1/8 inch bore, I ordered a "1 inch bore". I measured the new one. The measurement is the same as the one on the car. Either I was sent the wrong master or I didn't measure it correctly. Does anyone have a 1 inch master you can put a measure on?
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Old Jul 18, 2019 | 04:40 PM
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Not sure on the vette, but it is not unusual to have one master cylinder body machined for different bore sizes.
That would explain the large opening that you measured.
In that case, the master us usually stamped with the bore information.

If not stamped, the other option is to pop out a piston and measure it.
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Old Jul 18, 2019 | 09:33 PM
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Originally Posted by Fredtoo
Not sure on the vette, but it is not unusual to have one master cylinder body machined for different bore sizes.
That would explain the large opening that you measured.
In that case, the master us usually stamped with the bore information.

If not stamped, the other option is to pop out a piston and measure it.
The master I bought clearly said it was a 1 inch bore. I did pull the piston out to measure it.... Yep it's 1 1/8 inch bore. Seeing I ordered it just to get a smaller bore, it's going back.
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Old Jul 18, 2019 | 09:37 PM
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Originally Posted by kodpkd
The master I bought clearly said it was a 1 inch bore. I did pull the piston out to measure it.... Yep it's 1 1/8 inch bore. Seeing I ordered it just to get a smaller bore, it's going back.
Son of a B...

Assuming it was rebuilt, who was the re builder?
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Old Jul 18, 2019 | 11:18 PM
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Originally Posted by Fredtoo
Son of a B...

Assuming it was rebuilt, who was the re builder?

That's what I said..... I think it was new. At least it didn't say rebuilt. On Amazon from A team. It would be a good deal if you have power brakes. MC, + proportioning valve, manual adapter and brake lines for $100
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Old Jul 25, 2019 | 08:48 AM
  #50  
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I installed the new 1 inch master cylinder and organic pads. The car stops better. I can now make the tires chirp when I hit the brakes hard. I have a new proportioning valve. It isn't an original 68 corvette unit. Newer style. The car has the original 68 unit. If the old valve is working properly, would it be worth installing the new valve? Seems that it wouldn't make the braking better.
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Old Jul 25, 2019 | 08:53 AM
  #51  
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Congratulations on the repair
I would not bother with the proportioning valve, it should not make a difference.
Brake pads have a much greater influence on performance.

What brake pads did you put in it?
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Old Jul 25, 2019 | 09:00 AM
  #52  
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Originally Posted by Fredtoo
Congratulations on the repair
I would not bother with the proportioning valve, it should not make a difference.
Brake pads have a much greater influence on performance.

What brake pads did you put in it?
ACDelco 14D8 Advantage Organic Front Disc Brake Pad Set. Amazon,,,,,,, $19 for the front set.
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Old Jul 25, 2019 | 06:22 PM
  #53  
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If you need more stopping power, don't be afraid to try different pads.

https://www.rockauto.com/en/catalog/...brake+pad,1684

I found the Raybestos ones to work pretty good.
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Old Jul 26, 2019 | 08:56 AM
  #54  
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Originally Posted by Fredtoo
If you need more stopping power, don't be afraid to try different pads.

https://www.rockauto.com/en/catalog/...brake+pad,1684

I found the Raybestos ones to work pretty good.
Yes,,, I am curious about the Raybestos SP8XP. Under "improved stopping power". Also, how they do as far as wear goes. Do you have the SP8XP? Do you have manual brakes?
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Old Jul 26, 2019 | 09:31 AM
  #55  
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Originally Posted by kodpkd
Yes,,, I am curious about the Raybestos SP8XP. Under "improved stopping power". Also, how they do as far as wear goes. Do you have the SP8XP? Do you have manual brakes?
Hard to say about the SP8XP wear, as I have only put a few hundred miles on them.

I have power brakes, but poor engine vacuum.
In trying different pads, I have gotten from not being able to lock up crappy old bias ply tires, to being able to lock up grippy 18" performance tires.
I see no reason that this would not work better with your set up.
and
They are cheap to try.
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