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

C4 2 cup master cyl fix

Thread Tools
 
Search this Thread
 
Old Oct 3, 2012 | 08:40 PM
  #1  
leesvet's Avatar
leesvet
Thread Starter
Safety Car
10 Year Member
 
Joined: Apr 2011
Posts: 3,660
Likes: 22
Default C4 2 cup master cyl fix

Spent the day under the car...
big plan involved tightening the exhaust hangers so it didn't rattle anymore or bounce around when moto-x'n Texas city streets...and my own dirt road driveway...
bad news was finding rotten metal in the cat-back portion...Good news is the front still looks solid..but that might get cut up if I install some LT manifolds !
Can't win around here..

Got the brake MC done finally. The old single cup resevoir with the crossover tube was completely destroyed...went into a doz pieces when I tried to pull it off the master cylinder.

Installing the 2 new cups was challenging. One went on no problem. Wetted the grommet with brake fluid, set grommet in the cup, set cup on the master and pressed straight down...popped right in.

The 2nd (rear cup) was less cooperative. After 10 attempts I got it where I believe it will be ok. Problem was the grommet kept popping up over the metal collar or sleeve in the master, so instead of the grommet edge snapping in around the machined edge it would spit the grommet off the sleeve and ride up high inside the cup..so the cup was not fully seated. Sealed yes,. seated no. I thought I was pressing my luck pulling that cup off/on so many times with no spare or replacement anywhere in the same time zone, so I left it for today.

Question...
is there a better lube or some other method of popping & snapping the cups down on/in the master cylinder? I put grommet in cup, then cup on the master...and I've got 3 grommets and all did the same thing.
I ended up using a bit of white grease on the bottom of the grommet to see if that might help it slip on easier but it did not seem to matter.
Any suggestions on that? Those cups are just fragile enough to make me fearful of breaking one pushing or pulling on it. R



many thanks to Ralph for the help with parts !
Reply
Old Oct 3, 2012 | 08:52 PM
  #2  
tjandy's Avatar
tjandy
Intermediate
10 Year Member
 
Joined: Oct 2007
Posts: 38
Likes: 0
From: bolingbrook il.
Default

I think there is a special tool that is used. I tried for a day to do mine, it of course leaked. Took it to a shop they did it 10 minutes.
Reply




All times are GMT -4. The time now is 07:46 PM.

story-0
5 Best & 5 Most Overrated Corvette Track Packages of All Time!

Slideshow: The 5 best and 5 most overrated Corvette track packages ever.

By Joe Kucinski | 2026-06-09 12:46:45


VIEW MORE
story-1
Every 2027 Corvette Engine Explained

Slideshow: Every 2027 Corvette engine explained

By Joe Kucinski | 2026-06-09 12:16:31


VIEW MORE
story-2
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette

Slideshow: A Jaguar designer's personal project imagines what a modern front-engined Corvette might look like if Chevrolet revisited the golden age of the Stingray.

By Verdad Gallardo | 2026-06-08 19:53:43


VIEW MORE
story-3
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-4
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-5
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-6
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-7
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-8
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-9
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