C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

1986 brake line problem! help!

Thread Tools
 
Search this Thread
 
Old 08-02-2015, 11:06 PM
  #1  
joeyc4
5th Gear
Thread Starter
 
joeyc4's Avatar
 
Member Since: Aug 2015
Posts: 5
Likes: 0
Received 0 Likes on 0 Posts
Default 1986 brake line problem! help!

I recently purchased this car and ever since I bought it it has pulled the the right when I apply the brakes, so I replaced the drivers side front caliper and went to bleed the brake lines and I wasn't getting any fluid out the bleeder or the lines. So I traced the lines back and everything seemed fine up to the abs box, the vaccum line for the brakes had been cut and sealed shut with rubber and the rubber had rotted. Couldn't get into the abs box for some reason the cover wouldn't come off, any ideas?
Old 08-02-2015, 11:11 PM
  #2  
antfarmer2
Race Director
 
antfarmer2's Avatar
 
Member Since: Mar 2015
Posts: 15,926
Received 578 Likes on 555 Posts
Default

Take the rubber line off that side where it connects to the steel line. Might just be the rubber line is bad going to the caliper
Old 08-02-2015, 11:13 PM
  #3  
joeyc4
5th Gear
Thread Starter
 
joeyc4's Avatar
 
Member Since: Aug 2015
Posts: 5
Likes: 0
Received 0 Likes on 0 Posts
Default 1986 brake line

Already replaced the rubber line and still not getting fluid through the steel line
Old 08-02-2015, 11:23 PM
  #4  
antfarmer2
Race Director
 
antfarmer2's Avatar
 
Member Since: Mar 2015
Posts: 15,926
Received 578 Likes on 555 Posts
Default

Damn
Old 08-02-2015, 11:24 PM
  #5  
WVZR-1
Team Owner

 
WVZR-1's Avatar
 
Member Since: Sep 2003
Posts: 23,068
Received 2,258 Likes on 2,021 Posts

Default

What is this vacuum line you mention that has been cut and 'plugged'? Goes from where to where? What kept you out of the storage compartment that the ABS is in? Locked?
Old 08-02-2015, 11:52 PM
  #6  
joeyc4
5th Gear
Thread Starter
 
joeyc4's Avatar
 
Member Since: Aug 2015
Posts: 5
Likes: 0
Received 0 Likes on 0 Posts
Default

The vaccum went from the abs box to the front of the car into a rubber hose. And I think it's called an abs box, it's where the steel lined run to the stop in the back of the car. But I took all the bolts out and it still wouldn't pull off
Old 08-03-2015, 03:20 AM
  #7  
Cliff Harris
Race Director
 
Cliff Harris's Avatar
 
Member Since: Apr 2002
Location: Anaheim CA
Posts: 10,036
Likes: 0
Received 341 Likes on 312 Posts

Default

Originally Posted by joeyc4
Already replaced the rubber line and still not getting fluid through the steel line
It sounds like you're talking about this line:



If so, that's the vapor line from the gas tank to the vapor canister under the driver's side headlight. There is no vacuum going to the ABS box.

Last edited by Cliff Harris; 08-03-2015 at 03:23 AM.
Old 08-03-2015, 03:27 AM
  #8  
Cliff Harris
Race Director
 
Cliff Harris's Avatar
 
Member Since: Apr 2002
Location: Anaheim CA
Posts: 10,036
Likes: 0
Received 341 Likes on 312 Posts

Default

Originally Posted by joeyc4
the vaccum line for the brakes had been cut and sealed shut with rubber and the rubber had rotted.
The only rubber hose in the brake system is the one that connects the plenum to the brake booster.
Old 08-03-2015, 12:07 PM
  #9  
joeyc4
5th Gear
Thread Starter
 
joeyc4's Avatar
 
Member Since: Aug 2015
Posts: 5
Likes: 0
Received 0 Likes on 0 Posts
Default

So should I just replace the brake line for the drivers front? The whole steel line?
Old 08-03-2015, 12:30 PM
  #10  
antfarmer2
Race Director
 
antfarmer2's Avatar
 
Member Since: Mar 2015
Posts: 15,926
Received 578 Likes on 555 Posts
Default

Originally Posted by joeyc4
So should I just replace the brake line for the drivers front? The whole steel line?
I would trace it back breaking every connection till I found damage or till I got fluid. Might look into the proporting valve if it has one. Is it getting fluid out the other side?

Last edited by antfarmer2; 08-03-2015 at 12:49 PM.
Old 08-03-2015, 01:02 PM
  #11  
joeyc4
5th Gear
Thread Starter
 
joeyc4's Avatar
 
Member Since: Aug 2015
Posts: 5
Likes: 0
Received 0 Likes on 0 Posts
Default

It gets fluid tall all three, but I couldn't find damage, and our parts store just sells straight lines which would be a pain to bend, but there is no damage to the lines
Old 08-03-2015, 11:28 PM
  #12  
Cliff Harris
Race Director
 
Cliff Harris's Avatar
 
Member Since: Apr 2002
Location: Anaheim CA
Posts: 10,036
Likes: 0
Received 341 Likes on 312 Posts

Default

Do you get brake fluid out of the bleeder on the passenger side front caliper?

The front and rear brake circuits are completely separate and only share the master cylinder.
Old 02-04-2016, 08:23 PM
  #13  
starlightventure
Navigator
 
starlightventure's Avatar
 
Member Since: Nov 2009
Posts: 9
Likes: 0
Received 0 Likes on 0 Posts
Default

Originally Posted by Cliff Harris
Do you get brake fluid out of the bleeder on the passenger side front caliper?

The front and rear brake circuits are completely separate and only share the master cylinder.
I have the exact same problem on my 86, no brake fluid out of the front drivers side when bleeding, car pulls to the right when braking. So what is the problem, solution.
Old 02-04-2016, 10:16 PM
  #14  
jv9999
Melting Slicks
 
jv9999's Avatar
 
Member Since: Jan 2014
Location: Lunenburg MA
Posts: 2,013
Received 317 Likes on 271 Posts

Default

It's most likely the ABS pump is bad which is unfortunate as they are hard to come by and expensive. I'm sure some searching will turn up many others who have been down this road.
Old 02-05-2016, 01:11 AM
  #15  
VikingTrad3r
Oil Producer
Support Corvetteforum!
 
VikingTrad3r's Avatar
 
Member Since: Apr 2014
Posts: 8,705
Received 2,262 Likes on 1,446 Posts

Default

Originally Posted by jv9999
It's most likely the ABS pump is bad which is unfortunate as they are hard to come by and expensive. I'm sure some searching will turn up many others who have been down this road.

this is an old thread but the new poster should "cycle" the abs pump first before anything else. find gravel or snow and lock up. not too fast just get the pump tocycle 4 or 5 times.

if u notice any change for the better, rebleed, repeat. should be good to go. i was on my 87.
do 86 have abs?
Old 02-05-2016, 06:12 AM
  #16  
hcbph
Safety Car
 
hcbph's Avatar
 
Member Since: Aug 2013
Location: Minneapolis Mn
Posts: 4,199
Received 526 Likes on 476 Posts

Default

86 does have abs. I've read up on this before as I thought I had a problem with the abs pump at one time. One thing recommended was disconnecting the lines and try backflushing the abs pump as apparently at times junk will get into the pump and block some of the small openings in it. I have not done that and only mention this as it was recommended by others with pump problems like described.

When I bought my 86 over 2 years ago I looked to see who repaired or rebuilt them, at that time I was unsuccessful finding anyone that did that any more. I did find one thread where someone removed the pump and put a proportioning valve in it's place and apparently it worked though you wouldn't have abs any more.

Get notified of new replies

To 1986 brake line problem! help!




Quick Reply: 1986 brake line problem! help!



All times are GMT -4. The time now is 03:56 PM.