Wrong Pedal to the floor
Thread Starter
Le Mans Master
Joined: Aug 2017
Posts: 8,336
Likes: 2,810
From: Cool Northern Michigan
Wrong Pedal to the floor
On my '77: New bench bled master cyl 
(4x) one new caliper, new hose, clip, copper washer. New Proportioning valve. Bleed all four corners again in proper order. Still no pedal. (Using vacuum pump method) Still pedal goes to the floor. No fluid on garage floor, no loss of fluid in master. Have "Prop valve-centering tool" inserted in place of brake switch for now. Why no pedal pressure?
(4x) one new caliper, new hose, clip, copper washer. New Proportioning valve. Bleed all four corners again in proper order. Still no pedal. (Using vacuum pump method) Still pedal goes to the floor. No fluid on garage floor, no loss of fluid in master. Have "Prop valve-centering tool" inserted in place of brake switch for now. Why no pedal pressure?
Melting Slicks
Joined: Jun 2011
Posts: 3,116
Likes: 598
On my '77: New bench bled master cyl (4x) one new caliper, new hose, clip, copper washer. New Proportioning valve. Bleed all four corners again in proper order. Still no pedal. (Using vacuum pump method) Still pedal goes to the floor. No fluid on garage floor, no loss of fluid in master. Have "Prop valve-centering tool" inserted in place of brake switch for now. Why no pedal pressure?
(4x) one new caliper, new hose, clip, copper washer. New Proportioning valve. Bleed all four corners again in proper order. Still no pedal. (Using vacuum pump method) Still pedal goes to the floor. No fluid on garage floor, no loss of fluid in master. Have "Prop valve-centering tool" inserted in place of brake switch for now. Why no pedal pressure?https://www.corvetteforum.com/forums...-cylinder.html
Once this is completed try bleeding the calipers again. Also how many bleed screws on each caliper did you bleed ?
Instructor
Joined: May 2017
Posts: 196
Likes: 16
From: Rancho Santa Margarita CA
, you just have to get the back of the car really high, I could not do it with jack stands even at their highest. Pump them about 5 times before you bleed the calipers, I also found tapping with a rubber mallet on the caliper will free some air. I use the vacuum just to get it started and gravity bleed them with a hose bended up slightly before it goes down into a drip pan.I usually go through a 6 pack during a gravity bleed and 1 pint of fluid per caliper.
Last edited by JayRay; Aug 1, 2017 at 11:37 PM.
Drifting
Joined: Nov 2013
Posts: 1,547
Likes: 282
From: Scottsdale Arizona
I had a difficult time getting the plate to seal too. I went to HF and bought two large C-clamps and it sealed nicely.
Thread Starter
Le Mans Master
Joined: Aug 2017
Posts: 8,336
Likes: 2,810
From: Cool Northern Michigan
Trouble is, with rear higher than the master cyl, calipers would not gravity bleed. Still no pedal today, to the floor. No bubbles in clear hose using vacuum pump. At a loss. Will look at new proportioning valve Thur. New master cyl looks and acts perfect.
Melting Slicks
Joined: Jun 2011
Posts: 3,116
Likes: 598
Clearing the air in the master cylinder may take many slow pumps of the brake pedal to clear all air. You should see fluid push up in the master cylinder reservoir once the air is clear.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Racer
Joined: Aug 2005
Posts: 355
Likes: 18
From: Corona Ca
I tried using vacuum on one vehicle and had leakage between the caliper and the bleeder. Would rather pull the vacuum past the threads instead of moving the fluid. I put Teflon tape on the threads and it helped a great deal. Generally use vacuum to get fluid all through system and the have a helper run the pedal.
I've had "ehhh" luck with gravity bleeding.
Planning on buying a Motive as I have enough vehicles to justify the cost, and I know I will use it more than once.
I've had "ehhh" luck with gravity bleeding.
Planning on buying a Motive as I have enough vehicles to justify the cost, and I know I will use it more than once.
Last edited by chevygod; Aug 2, 2017 at 08:16 PM.
Melting Slicks
Joined: Jun 2011
Posts: 3,116
Likes: 598
I tried using vacuum on one vehicle and had leakage between the caliper and the bleeder. Would rather pull the vacuum past the threads instead of moving the fluid. I put Teflon tape on the threads and it helped a great deal. Generally use vacuum to get fluid all through system and the have a helper run the pedal.
I've had "ehhh" luck with gravity bleeding.
Planning on buying a Motive as I have enough vehicles to justify the cost, and I know I will use it more than once.
I've had "ehhh" luck with gravity bleeding.
Planning on buying a Motive as I have enough vehicles to justify the cost, and I know I will use it more than once.
Le Mans Master
Joined: Oct 2006
Posts: 8,941
Likes: 35
From: El Cajon California
Old School works for me, my daughter pressing the pedal to the floor, me tightening the bleeder screw etc if you do it in this sequence....
Left rear inner
Left rear outer
Right rear inner
Right rear outer
Left front
Right front
the sequence is odd but it will work
Left rear inner
Left rear outer
Right rear inner
Right rear outer
Left front
Right front
the sequence is odd but it will work
Thread Starter
Le Mans Master
Joined: Aug 2017
Posts: 8,336
Likes: 2,810
From: Cool Northern Michigan
Looks like just the opposite of some manuals I have seen. H-m-m-m-m-m. Which book is correct? Left side, right side, inner, outer, back, front, rear, center? I thought "Old School" was: farthest bleeder from the master to closest bleeder?
Melting Slicks
Joined: Jun 2011
Posts: 3,116
Likes: 598
Then you bleed from the longest brake lines to the shortest brake lines. AS you described.
Eg on the 78 the rear right is the longest. Then LR , RF, then LF.
If the system is completely empty I start with the shortest to the longest and then reverse the order again.
Le Mans Master
Joined: Oct 2006
Posts: 8,941
Likes: 35
From: El Cajon California
I know it seems backwards, I have been down this road before, Trust me on this
Thread Starter
Le Mans Master
Joined: Aug 2017
Posts: 8,336
Likes: 2,810
From: Cool Northern Michigan
Using the "pedal method" to bleed the brakes will likely trip the valve in the proportioning valve. There is a plastic tool ($10) that temporarly replaces the brake failure switch / light and will keep the valve centered until bleeding is complete. Any loss of pressure in the system will trigger that prop valve. I will stick with the no pedal / Motive style or vaccum style. Thanks anyway.
Le Mans Master
Joined: Oct 2006
Posts: 8,941
Likes: 35
From: El Cajon California
It really doesn't matter unless you are trying to use the least amount of fluid to flush / bleed the system.
Then you bleed from the longest brake lines to the shortest brake lines. AS you described.
Eg on the 78 the rear right is the longest. Then LR , RF, then LF.
If the system is completely empty I start with the shortest to the longest and then reverse the order again.
Then you bleed from the longest brake lines to the shortest brake lines. AS you described.
Eg on the 78 the rear right is the longest. Then LR , RF, then LF.
If the system is completely empty I start with the shortest to the longest and then reverse the order again.
Instructor
Joined: Dec 2016
Posts: 245
Likes: 132
From: Port Coquitlam BC
Using the "pedal method" to bleed the brakes will likely trip the valve in the proportioning valve. There is a plastic tool ($10) that temporarly replaces the brake failure switch / light and will keep the valve centered until bleeding is complete. Any loss of pressure in the system will trigger that prop valve. I will stick with the no pedal / Motive style or vaccum style. Thanks anyway.
Rob
Team Owner
Joined: Mar 2002
Posts: 44,677
Likes: 1,830
From: Huntsville AL
https://www.summitracing.com/parts/s...+5d88fb1288741
Thread Starter
Le Mans Master
Joined: Aug 2017
Posts: 8,336
Likes: 2,810
From: Cool Northern Michigan
^^^this^^^ Stop the presses! Its on sale too.
Yes, this goes way back.
Click on my avatar to the left, then my photo albums, brake bleeding.
There you will see what you need to buy or above ^^^^
Summit has it, but shpg $ ?
Try eBay maybe.
Yes, this goes way back.
Click on my avatar to the left, then my photo albums, brake bleeding.
There you will see what you need to buy or above ^^^^
Summit has it, but shpg $ ?
Try eBay maybe.
Last edited by HeadsU.P.; Jun 22, 2022 at 07:03 AM.
Le Mans Master
Joined: May 2007
Posts: 5,028
Likes: 1,120
From: North tonawanda NY