sonjaab Posted December 11, 2019 Report Share Posted December 11, 2019 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. Quote 93 DeVille-13 Chevy Impala 72 GTO - 77 Triumph Bonneville 84 Z-28 Syracuse NY Link to comment Share on other sites More sharing options...
sonjaab Posted December 15, 2019 Author Report Share Posted December 15, 2019 (edited) 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! Edited December 15, 2019 by sonjaab Quote 93 DeVille-13 Chevy Impala 72 GTO - 77 Triumph Bonneville 84 Z-28 Syracuse NY Link to comment Share on other sites More sharing options...
Göran W Posted December 15, 2019 Report Share Posted December 15, 2019 Nice car! Hope You get it up and running soon. Quote Link to comment Share on other sites More sharing options...
sonjaab Posted December 18, 2019 Author Report Share Posted December 18, 2019 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? Quote 93 DeVille-13 Chevy Impala 72 GTO - 77 Triumph Bonneville 84 Z-28 Syracuse NY Link to comment Share on other sites More sharing options...
Göran W Posted December 19, 2019 Report Share Posted December 19, 2019 Not yet….. Mostly due to lack of sunshine and space.😏 Quote Link to comment Share on other sites More sharing options...
sonjaab Posted December 24, 2019 Author Report Share Posted December 24, 2019 Finally got the new master cyl. and its gonna be almost 50 and sorta warm here in NY again today so will be installing it later today! Quote 93 DeVille-13 Chevy Impala 72 GTO - 77 Triumph Bonneville 84 Z-28 Syracuse NY Link to comment Share on other sites More sharing options...
sonjaab Posted December 31, 2019 Author Report Share Posted December 31, 2019 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! Quote 93 DeVille-13 Chevy Impala 72 GTO - 77 Triumph Bonneville 84 Z-28 Syracuse NY Link to comment Share on other sites More sharing options...
Göran W Posted December 31, 2019 Report Share Posted December 31, 2019 😎😎 Quote Link to comment Share on other sites More sharing options...
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