C3 Tech/Performance V8 Technical Info, Internal Engine, External Engine, Basic Tech and Maintenance for the C3 Corvette
Sponsored by:
Sponsored by:

Brake help

Thread Tools
 
Search this Thread
 
Old Jul 17, 2012 | 01:53 PM
  #1  
lonzoo's Avatar
lonzoo
Thread Starter
Pro
10 Year Member
Liked
Loved
Top Answer: 1
 
Joined: Jun 2011
Posts: 588
Likes: 41
From: Ohio
Default Brake help

My 78 brakes just started acting wierd. When I apply the brakes the pedal goes within1/2 inch from floor but stops OK. If I pump it just once it comes back to normal. I have held it down both in the low position and the normal position after a pump and the brake is firm and the pedal never moves any farther down. No leaks, master full. The power booster seems ok. With engine off the pedal is up and rock hard. Any ideas out there? i am thinking MC. Am I on the right track?

thanks Lonzoo
Reply
Old Jul 17, 2012 | 03:34 PM
  #2  
Easy Mike's Avatar
Easy Mike
Team Owner
Supporting Lifetime
20 Year Member
 
Joined: Jun 2000
Posts: 38,923
Likes: 1,481
From: Southbound
Cruise-In II Veteran
Default

I think you need to R&R the entire system; all four calipers, master cylinder, brake hoses.

Reply
Old Jul 17, 2012 | 03:56 PM
  #3  
drwet's Avatar
drwet
Melting Slicks
15 Year Member
Liked
Loved
Community Favorite
 
Joined: Dec 2009
Posts: 3,212
Likes: 639
From: Thunder Bay
Default

Originally Posted by Easy Mike
I think you need to R&R the entire system; all four calipers, master cylinder, brake hoses.

That will probably solve the problem but probably isn't necessary. I suspect you have air in the system. Start by bleeding and see if you can get a firm pedal. If so, you probably need to rebuild your calipers (or buy rebuilt ones). That is likely where the air is getting in. Pretty common on these cars and often results from too much runout in the rotors.
Reply
Old Jul 17, 2012 | 04:21 PM
  #4  
dgood's Avatar
dgood
Burning Brakes
 
Joined: Apr 2009
Posts: 807
Likes: 2
From: VIRGINIA BEACH VIRGINIA
Default

I had similar problem and after getting new calipers from advance auto the problem was still there. Replaced the rubber hoses that connect to the calipers on each tire and it fixed the problem. Some one on here told me to do that and it worked.
Reply

Get notified of new replies

To Brake help





All times are GMT -4. The time now is 10:04 AM.

story-0
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!

Slideshow: the top 10 things Corvette owners want in the C9 Corvette

By Michael S. Palmer | 2026-04-30 12:41:15


VIEW MORE
story-1
10 Revolutionary 'Corvette Firsts' Most People Don't Know

Slideshow: 10 Important Corvette 'firsts' that every fan should know.

By Joe Kucinski | 2026-04-29 17:02:16


VIEW MORE
story-2
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2

Slideshow: Should you buy a 2020-2026 Corvette or wait for 2027?

By Michael S. Palmer | 2026-04-22 10:08:58


VIEW MORE
story-3
2027 Corvette vs The World: Every C8 vs Its Closest Competitor

Slideshow: 2027 Corvette lineup vs the world.

By Joe Kucinski | 2026-04-24 16:12:42


VIEW MORE
story-4
10 Most Common Corvette Problems of the Last 20 Years!

Slideshow: 10 major Corvette problems from the last 20 years.

By Joe Kucinski | 2026-04-14 16:37:05


VIEW MORE
story-5
5 MOST and 5 LEAST Popular Corvette Model Years in History!

Slideshow: 5 most and least popular Corvette model years.

By Joe Kucinski | 2026-04-08 13:25:01


VIEW MORE
story-6
2027 Corvette Buyer's Guide: Everything You Need to Know!

Slideshow: 2027 Corvette buyer's guide

By Joe Kucinski | 2026-04-17 16:41:08


VIEW MORE
story-7
10 Things C8 Corvette Owners Hate (But Won't Tell You)

Slideshow: 10 things C8 Corvette owners hate, but won't tell you.

By Joe Kucinski | 2026-04-01 18:36:07


VIEW MORE
story-8
10 Best Corvettes Coming to Barrett-Jackson Palm Beach 2026!

Slideshow: Should you add one of these incredible Corvettes to your garage?

By Brett Foote | 2026-04-01 18:14:05


VIEW MORE
story-9
Every Corvette Grand Sport Explained! (C2, C4, C6, C7, & C8)

Slideshow: Every Corvette Grand Sport explained

By Joe Kucinski | 2026-03-26 07:13:44


VIEW MORE