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

Booster?

Thread Tools
 
Search this Thread
 
Old Jul 4, 2023 | 02:42 PM
  #1  
Shunyun's Avatar
Shunyun
Thread Starter
Racer
 
Joined: Sep 2022
Posts: 338
Likes: 67
From: Escondido, CA
Default Booster?

Symptoms:
- Pedal travel when engine off or on is about 2.5-3.0”
- In gear (R or D) have to stand on the pedal
- At idle, plenum vacuum wavers around 40
- At idle with booster vacuum line pinched, vacuum is 50 and steady.

Does that mean I need to replace the booster? Can it be repaired?



Vacuum wavering around 40

Vacuum solid at 50 with Booster vacuum line pinched
Reply
Old Jul 4, 2023 | 03:16 PM
  #2  
s carter's Avatar
s carter
Melting Slicks
10 Year Member
Liked
Loved
Community Favorite
 
Joined: May 2014
Posts: 2,895
Likes: 592
From: New Port Richey FL
Default

Couple of easy tests, with car off pump up the brake and hold. You already proved you have Vacuum
Start the car does the pedal drop yes or no
if yes the booster still has Some life left in it.
next with car running door closed rest foot on brake litely, is there a very noticeable Hiss if yes it's Dead time to find Booster.
Reply
Old Jul 4, 2023 | 03:48 PM
  #3  
Shunyun's Avatar
Shunyun
Thread Starter
Racer
 
Joined: Sep 2022
Posts: 338
Likes: 67
From: Escondido, CA
Default

Originally Posted by s carter
Couple of easy tests, with car off pump up the brake and hold. You already proved you have Vacuum
Start the car does the pedal drop yes or no
if yes the booster still has Some life left in it.
next with car running door closed rest foot on brake litely, is there a very noticeable Hiss if yes it's Dead time to find Booster.
no drop. That confirms for me. Just going to buy a new one, be done with it. Thanks @s carter
Reply
Old Jul 4, 2023 | 04:18 PM
  #4  
s carter's Avatar
s carter
Melting Slicks
10 Year Member
Liked
Loved
Community Favorite
 
Joined: May 2014
Posts: 2,895
Likes: 592
From: New Port Richey FL
Default

If you get a plastic one make sure that when you put the master back on that it slides all the way down to flush with booster, no draw it down that last little bit otherwise it to will crack in a year or so and don't over tighten it No Super Wrenching

If the master doesn't sit flush file/Dremel the master holes the hair needed

Last edited by s carter; Jul 4, 2023 at 04:42 PM.
Reply

Get notified of new replies

To Booster?





All times are GMT -4. The time now is 03:46 AM.

story-0
10 Ugly Corvettes That We Still Kinda Love

Slideshow: 10 ugly Corvettes that we still kinda love.

By Joe Kucinski | 2026-06-03 10:34:17


VIEW MORE
story-1
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer

A lot of money has changed hands at the online auction house over the years.

By Brett Foote | 2026-06-03 10:21:50


VIEW MORE
story-2
10 Things Every Corvette Owner Needs (2026 Edition)

Slideshow: 10 great gifts Corvette enthusiasts actually want for Father's Day!

By Michael S. Palmer | 2026-06-03 15:43:40


VIEW MORE
story-3
8 Most "Only Corvette Owners Understand" Quirks and Problems

Slideshow: These are the quirks, annoyances, and oddly lovable problems that every Corvette owner eventually learns to live with.

By Pouria Savadkouei | 2026-05-28 09:31:39


VIEW MORE
story-4
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years

Slideshow: 10 reasons why the C6 Z06 is still a performance benchmark after 20 years.

By Joe Kucinski | 2026-05-27 17:20:09


VIEW MORE
story-5
How Much Horsepower Every Corvette Engine "LOST" in 1972

Slideshow: How much horsepower every Corvette engine lost in 1972.

By Joe Kucinski | 2026-05-27 16:54:53


VIEW MORE
story-6
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!

Slideshow: How to Protect A Convertible Top: 10 DOs & DON'Ts

By Michael S. Palmer | 2026-04-03 00:00:00


VIEW MORE
story-7
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!

Slideshow: The 10 most explosive Corvettes ever built based on power-to-weight ratio.

By Joe Kucinski | 2026-05-20 07:23:03


VIEW MORE
story-8
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter

Slideshow: From C1 to C8 we compare every Corvette generation by the numbers.

By Joe Kucinski | 2026-05-12 16:54:12


VIEW MORE
story-9
8 Coolest Corvette Pace Cars (and Replicas) of All Time

Slideshow: Some Corvette pace cars became collectible legends, while others perfectly captured the look and attitude of their era.

By Verdad Gallardo | 2026-05-11 09:50:51


VIEW MORE