Buick35 Posted February 11, 2020 Share Posted February 11, 2020 This happened to me before,when driving my car sometimes will loose power because the brakes will come on.I then have to pop the hood and crack open a brake line on the master cylinder and then it will roll. I recently replaced all the rubber brake hoses. The p/o ran silicone brake fluid in it so I serviced it with the same.Could the master cylinder be bad? It's got a new switch also.Thanks Link to comment Share on other sites More sharing options...
mike6024 Posted February 12, 2020 Share Posted February 12, 2020 I think the brake M/C piston may not be retracting all the way if you know what I mean. Link to comment Share on other sites More sharing options...
Buick35 Posted February 12, 2020 Author Share Posted February 12, 2020 Thanks Link to comment Share on other sites More sharing options...
mike6024 Posted February 12, 2020 Share Posted February 12, 2020 https://www.mgexp.com/forum/mgb-and-gt-forum.1/new-78-b-brake-booster-cylinder-install.3719837/ some of this talks about the rod adjustment, and some other possibly relevant things. Link to comment Share on other sites More sharing options...
Buick35 Posted February 12, 2020 Author Share Posted February 12, 2020 Thanks,mine dose not have a brake booster though.I think I'll replace the master cylinder and see what happens.Greg. Link to comment Share on other sites More sharing options...
oldcar Posted February 13, 2020 Share Posted February 13, 2020 (edited) Basically what is happening is that the piston in the master cylinder is not returning sufficiently to allow the fluid to drain back correctly. Each time you apply the brakes the fluid builds up a little more, eventually preventing the brakes from "comming off" . i.e. Locking on! Probably a rebuilt master cylinder and a full flushing of the system and finally a complete change to new fluid will cure your problem. Hydraulic brakes used to require a complete flush and new fluid every two years. Today no one bothers until there is a problem. Even "modern" hydraulic fluids are not intended to last for ever. Bj Edited February 13, 2020 by oldcar (see edit history) Link to comment Share on other sites More sharing options...
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