ZR-1 Net Registry Forums  

Go Back   ZR-1 Net Registry Forums > C4 ZR-1 > C4 ZR-1 Technical Postings

Reply
 
Thread Tools Display Modes
Old 06-15-2020   #1
Zman
 
Join Date: Jun 2019
Location: WI
Posts: 131
Default Front brakes both sides dragging

I took my 92 out today for a quick spin and when I got back I noticed a hot brake smell. Checked rears nice and cool, checked fronts and both very hot! Hot enough I couldn?t touch the Rims. I do know my clutch is starting to leak by. If I hold it to the floor in gear it gradually engages. Are these two systems connected? Please excuse my lack of mechanical aptitude. I did put the car in neutral while waiting for the brakes to cool and the car did roll easily. Any ideas?
Zman is offline   Reply With Quote
Old 06-15-2020   #2
We Gone
 
Join Date: Apr 2004
Location: ATL. GA.
Posts: 2,170
Default Re: Front brakes both sides dragging

Just a guess as I went thru this a few years back. Front brake lines old and collapsing on the inside or bad Master cylinder. I did Master first and still had the issue went to all SS lines to the calipers problem solved.
__________________
Steve



1990 Steel Blue/Black #2355
1990 Red/Red #1473
1991 Quasar /Black #118 Sold
1991 Turquoise/Black #766 Parted Out
1993 Yellow/White #179 Sold
1990 Black/Gray #1361 Headers/4:10s Sold

Last edited by We Gone; 06-15-2020 at 08:53 PM.
We Gone is offline   Reply With Quote
Old 06-15-2020   #3
Zman
 
Join Date: Jun 2019
Location: WI
Posts: 131
Default Re: Front brakes both sides dragging

[QUOTE=We Gone;310380]Just a guess as I went thru this a few years back. Front brake lines old and collapsing on the inside or bad Master cylinder. I did Master first and still had the issue went to all SS lines to the calipers problem solved.[/QUOTE

Does the master cylinder control both the clutch and the brake hydraulics? I?m guessing this could be a laughable question.
Zman is offline   Reply With Quote
Old 06-15-2020   #4
32valvZ
 
32valvZ's Avatar
 
Join Date: Nov 2007
Location: Sunshine State
Posts: 1,071
Default Re: Front brakes both sides dragging

[QUOTE=Zman;310381]
Quote:
Originally Posted by We Gone View Post
Just a guess as I went thru this a few years back. Front brake lines old and collapsing on the inside or bad Master cylinder. I did Master first and still had the issue went to all SS lines to the calipers problem solved.[/QUOTE

Does the master cylinder control both the clutch and the brake hydraulics? I?m guessing this could be a laughable question.
It does not. The Clutch master cylinder is mounted on the firewall left of the brake booster and just under the ECM. Its connected to a clutch slave cylinder by way of a hydraulic line, which is what turns the hydraulic energy into mechanical energy.

The brake master controls front and rear brakes. About 60% of the braking power is supplied to the front brakes, and 40% to the rears. Thats controlled by a proportioning valve.

I would agree that you can have bad rubber brake hoses and possibly a bad master cylinder and even still, calipers that could be in need of a rebuild or replaced with rebuilt units.
__________________
[B]1990 #2815[/B]
[COLOR="Red"][B]Red/Red[/B][/COLOR]
Ported Plenum & IH (by Pete)
Haibeck Chip
Rebuilt FPR (by Phil)
FIC Injectors
Watson LT Headers
3" Stainless Works exhaust
Lingenfelter Open Air Lid
Bill B Built Transmission
Shifter & C Beam Plates


[FONT=Impact][COLOR=red]1992 [COLOR=black]#[/COLOR] 091[/COLOR][/FONT]
[FONT=Impact][COLOR=#ff0000]Red/[COLOR=silver]Gray[/COLOR][/COLOR][/FONT]
[B]SOLD[/B]
32valvZ is offline   Reply With Quote
Old 06-15-2020   #5
Zman
 
Join Date: Jun 2019
Location: WI
Posts: 131
Default Re: Front brakes both sides dragging

[QUOTE=32valvZ;310383]
Quote:
Originally Posted by Zman View Post

It does not. The Clutch master cylinder is mounted on the firewall left of the brake booster and just under the ECM. Its connected to a clutch slave cylinder by way of a hydraulic line, which is what turns the hydraulic energy into mechanical energy.

The brake master controls front and rear brakes. About 60% of the braking power is supplied to the front brakes, and 40% to the rears. Thats controlled by a proportioning valve.

I would agree that you can have bad rubber brake hoses and possibly a bad master cylinder and even still, calipers that could be in need of a rebuild or replaced with rebuilt units.
Thanks for the information. Not failing from lack of use, more like too much use.
Thanks again.
Zman is offline   Reply With Quote
Old 06-15-2020   #6
Zman
 
Join Date: Jun 2019
Location: WI
Posts: 131
Default Re: Front brakes both sides dragging

Is this work that can be done by ?Any? mechanic or is It suggested to take it to one of our specialists?
Zman is offline   Reply With Quote
Old 06-16-2020   #7
We Gone
 
Join Date: Apr 2004
Location: ATL. GA.
Posts: 2,170
Default Re: Front brakes both sides dragging

Quote:
Originally Posted by Zman View Post

Does the master cylinder control both the clutch and the brake hydraulics? I?m guessing this could be a laughable question.
Guess I should have clarified a bit better I am referring to the brake master cylinder and original rubber lines to the calipers. As to your clutch issue most likely needs clutch and or slave cylinders replaced or rebuilt, if you do one I would do both. Many posts on the clutch parts here just do a search.
__________________
Steve



1990 Steel Blue/Black #2355
1990 Red/Red #1473
1991 Quasar /Black #118 Sold
1991 Turquoise/Black #766 Parted Out
1993 Yellow/White #179 Sold
1990 Black/Gray #1361 Headers/4:10s Sold
We Gone is offline   Reply With Quote
Old 06-15-2020   #8
Corvette95
 
Corvette95's Avatar
 
Join Date: Jan 2006
Location: Decatur, AL
Posts: 1,119
Default Re: Front brakes both sides dragging

If you have a floor jack, jack up the fronts, one side at a time, motor OFF, emergency brake off, transmission out of gear, see if the wheel (each side one at a time) will spin freely by hand. If you are unsure about doing this own your own...TAKE IT TO A SHOP. Be careful and use proper precautions when jacking up any vehicle. (put a block in front and behind one of rear wheels to prevent rolling). This will tell you if the front brakes are dragging or locked up. Front brakes will most always be much hotter than rear on a street car.
__________________
Corvette95 Registry and Forum (*************)
1989 C4 Conv Wht/Gry Auto Hardtop Top Flight SOLD
1995 C4 Coupe Purple/Blk 6 Speed
1989 C4 Conv Wht/Red Auto SOLD
1996 C4 Conv Black/Tan Auto SOLD
1994 C4 Coupe Wht/Blk SOLD
1995 C4 ZR-1 White/Gry #278 Dual Dunn Head SOLD
1986 C4 Coupe Black/Red 4+3 SOLD
1990 C4 ZR-1 Red/Red #0454
Corvette95 is offline   Reply With Quote
Reply


Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 11:09 AM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Copyright ZR-1 Net Registry 2020