Brakes randomly go to floor - Chevelle Tech
Brakes, Suspension & Steering Conversion questions & more.

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post #1 of 9 (permalink) Old Aug 9th, 18, 11:34 PM Thread Starter
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Justin
 
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Brakes randomly go to floor

So I have a weird problem when driving my car and sometimes not every time but I push in the clutch and try and come to a stop the brake pedal will go to the floor. It will not do it if the clutch is not pushed in so that’s why I’m at a loss. But I can pump he brakes and the pressure comes back. I checked the brake fluid and it’s still full. I can’t see any leaks either

1974 chevelle with 73 laguna nose sbc 357 Brodix IK180 heads Comp Cams XE274H Edelbrock RPM airgap 650 AED double pumper, M20 muncie, Truetrac with 3.73s
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post #2 of 9 (permalink) Old Aug 10th, 18, 2:19 PM
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Re: Brakes randomly go to floor

you might have air in your system or your master is getting ready to take a dump.
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post #3 of 9 (permalink) Old Aug 10th, 18, 2:53 PM
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Re: Brakes randomly go to floor

Think pushing in the clutch is just a coincidence. I would inspect all the lines for leaks or damage especially the flexible front lines. If all good do a good brake bleed on all brakes. If trouble persists master cylinder would be next suspect.
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post #4 of 9 (permalink) Old Aug 10th, 18, 3:13 PM
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Re: Brakes randomly go to floor

Sounds like it may have something to do with the clutch/brake pedal assembly. May want to check and see if there's any play in the pivot point in both pedals.
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post #5 of 9 (permalink) Old Aug 10th, 18, 10:37 PM
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Re: Brakes randomly go to floor

Replace the M/C, and bleed the system.
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post #6 of 9 (permalink) Old Aug 10th, 18, 11:29 PM Thread Starter
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MC are cheap enough I might just replace it and bleed the system. I did the drive the car last night and today and it never did it and I tried to make it do it but it didn’t.

1974 chevelle with 73 laguna nose sbc 357 Brodix IK180 heads Comp Cams XE274H Edelbrock RPM airgap 650 AED double pumper, M20 muncie, Truetrac with 3.73s
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post #7 of 9 (permalink) Old Aug 12th, 18, 1:14 PM
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Quote:
Originally Posted by OLDED View Post
Replace the M/C, and bleed the system.
what he said☝️
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post #8 of 9 (permalink) Old Aug 12th, 18, 1:30 PM Thread Starter
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Quote:
Originally Posted by BlakeSixty8 View Post
Quote:
Originally Posted by OLDED View Post
Replace the M/C, and bleed the system.
what he said☝️
I got one on the way from summit.
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post #9 of 9 (permalink) Old Aug 15th, 18, 12:18 PM Thread Starter
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New master cylinder from summit, it’s an AC delco. Just bled the system and took it for a drive and it seems to be better than before. The pedal is firmer which I like.
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1974 chevelle with 73 laguna nose sbc 357 Brodix IK180 heads Comp Cams XE274H Edelbrock RPM airgap 650 AED double pumper, M20 muncie, Truetrac with 3.73s
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