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Leaking Master Cylinder


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I had the brake light come on in my  93 Deville the other day.  So I noted my brake fluid was low and turning on

the brake light.  Checked to make sure the parking brake wasnt pushed down by accident.  I sort of figured the

brakes were getting worn down by the 15k miles I put on it during the last year I owned it and figured it was

normal so why the fluid being low. 

A week later the brake light was on again and the fluid was low.

So I checked all 4 wheels (have rear drums) and lines.  I know see that the firewall is wet with the clear

brake fluid. 

I note the master cylinder is leaking where it bolts to the firewall and the firewall is wet with fluid.

So I order a new master cyl. from Rock Auto since NO parts houses near me have a JM-4 master cyl.

in stock.  (yea those 85-93 square bodies use several different units verified from the RPO list.)

So while Im under the hood (in my nice warm garage spinnin the wrench) I guess I will swap out the $30

heater core again!  Only $32 bucks for the master cyl. too!

Will post the results when done!

YES!  I do have another car to drive while I wait for the parts.

 

 

caddy (7).JPG

93 DeVille-13 Chevy Impala

72 GTO - 77 Triumph Bonneville

84 Z-28

Syracuse NY

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WOW!  Rock auto kicked back my order as "out of stock".  I had to order a different unit!

Still no local places have the rare unicorn JM-4 master cylinder in stock either!

So i wait!

 

master cyl.jpg

Edited by sonjaab

93 DeVille-13 Chevy Impala

72 GTO - 77 Triumph Bonneville

84 Z-28

Syracuse NY

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Thanks G, 

Shes a Florida fresh grandma car that had 91k miles and nice paint and interior.

Needed tires and a heater core.  Now a master cylinder. 

Fixes and parts dirt cheap for these squarebodies!

You get your issues worked out?

93 DeVille-13 Chevy Impala

72 GTO - 77 Triumph Bonneville

84 Z-28

Syracuse NY

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Finished replacing the master cyl..

Bench bled it and installed it in minutes.

No issues and no brake lights on dash so it done!

Time to go ridin' before we get the expected lake effect blizzard starting later today

in Central/northern NY and the partiers be out boozin' and crusin' and the cops be

baggin' and taggin' for the new year!

 

93 DeVille-13 Chevy Impala

72 GTO - 77 Triumph Bonneville

84 Z-28

Syracuse NY

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