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  #1  
Old 07-21-2017, 12:43 PM
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Default Brakes not stopping very good !!

Well guys I'm on to the next problem . I'm not happy with the way my car brakes . I have the complete ZR-1 Brembo / Carbon Ceramic set up on my car. 7/8 bore manual master . The pedal seems very soft . If yo have to panic stop it ain't happening. No matter how hard you press the pedal you can not get the brakes to lock up. There is no air in the lines I checked for that . Wondering if anyone has any suggestions.
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Old 07-21-2017, 02:42 PM
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I thought I read on here somewhere that they (carbons) have to have a good bit of heat in them to work well... but I don't remember anybody saying they had to have heat to work period.
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Old 07-21-2017, 02:45 PM
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It sounds like you may have air in your master cylinder. It may need re bench bleed. I personally never liked the 7/8 due to more pedal travel. I always thought a 15/16 would be perfect and I think they make it now. I ended up with a 1" on mine and preferred it over the 7/8. It was a higher firm pedal. It did take some leg.

Assuming your caliper pistons and master cylinder have been calculated correctly.
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Old 07-21-2017, 04:52 PM
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Does it have a wilwood master on it? There is a recall on 7/8 bore masters.
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Old 07-21-2017, 05:46 PM
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Quote:
Originally Posted by Ketzer View Post
I thought I read on here somewhere that they (carbons) have to have a good bit of heat in them to work well... but I don't remember anybody saying they had to have heat to work period.
I thought so to but I've put plenty of heat on them and still the same.
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Originally Posted by Vegas69 View Post
It sounds like you may have air in your master cylinder. It may need re bench bleed. I personally never liked the 7/8 due to more pedal travel. I always thought a 15/16 would be perfect and I think they make it now. I ended up with a 1" on mine and preferred it over the 7/8. It was a higher firm pedal. It did take some leg.

Assuming your caliper pistons and master cylinder have been calculated correctly.
I will look into that Todd Thanx
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Does it have a wilwood master on it? There is a recall on 7/8 bore masters.
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Old 07-21-2017, 07:00 PM
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Quote:
Originally Posted by Vegas69 View Post
It sounds like you may have air in your master cylinder. It may need re bench bleed. I personally never liked the 7/8 due to more pedal travel. I always thought a 15/16 would be perfect and I think they make it now. I ended up with a 1" on mine and preferred it over the 7/8. It was a higher firm pedal. It did take some leg.

Assuming your caliper pistons and master cylinder have been calculated correctly.
I've the got Wilwood 1" on mine too. Locks up all four and emits white smoke when needed. Great pedal feel.
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Old 07-21-2017, 09:38 PM
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Are you able to push the pedal all the way to the floor? Perhaps you need to move the seat forward or a put pillow behind you to help those short legs reach the pedal. You can always go old school and tape a block to the pedal.

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Old 07-22-2017, 01:11 AM
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What are the specs on the factory ZR1 master? It stops just fine with little heat in the rotors. From what I understand, there's nothing magic about the CC stuff until you get into ABS programming, which isn't an issue here. I'd expect with a proper master you should have good brakes with the possible downside being that they'll get grabby and prone to locking up when you get them good and warm. Opposite of the issue you're having.

Edit: just realized the lack of power assist will make that comparison to the factory part less meaningful. Maybe Tobin with Kore3 can assist, he's good with the math stuff
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Last edited by JKnight; 07-22-2017 at 01:16 AM.
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Old 07-22-2017, 08:23 AM
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Quote:
Originally Posted by Spiffav8 View Post
Are you able to push the pedal all the way to the floor? Perhaps you need to move the seat forward or a put pillow behind you to help those short legs reach the pedal. You can always go old school and tape a block to the pedal.

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Old 07-22-2017, 09:47 AM
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Personally I would put power brakes on it, but thats just me. Sometimes safety/function should outway form, or make it a focal point. Most the manual brakes setups I have done (customer request) I am rarely happy with the outcome.
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