HELLO I HAVE SERIOUS BRAKE PROBLEM WITH MY 1994 HONDA ACCORD WHICH IS WHILE DRIVING DAILY THE HYDRAULIC BRAKE SYSTEM TENDS TO BUILD PRESSURE IN THE LINES WHICH CAUSES THE BRAKES TO LOCK UP WHILE DRIVING. I WAS TOLD THAT THE PROPORTIONING VALVE MIGHT BE THE PROBLEM. THANKS FOR THE YOUR HELP
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1994 Honda Accord Question: BRAKE PROBLEM
patrick mannion from Greg Solow's Engine Room, April 02, 2010, 11:08Master
Has the brake master cylinder been replaced? If so I suspect the clearance at the brake master cylinder actuating piston to brake booster actuating plunger is insufficient, as the brakes get used a few times the get hot and the clearance becomes less allowing the brakes to drag or even lock up.
Answer #2rdude135 April 03, 2010, 09:45Journeyman
This issue can happen when some other fluid other than brake fluid is introduced into the system. Typically automatic transmission fluid is mistakenly put in the master cylinder but I have seen other fluids cause the same symptoms. If the master cylinder has not been replaced then I would look for some type of contamination.