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84-85 Trucks & 4Runners 2nd gen pickups and 1st gen 4Runners with solid front axles

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Old 05-05-2010, 06:42 PM   #1
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Mysterious brake fluid loss

Got an 84 truck (2WD, 5-speed). Have had to fill the brake fluid reservour three times in the last few weeks. I don't see ANY fluid spots on the ground where parked. Took off all four tires and inspected calipers for leaks. None! Also followed all plumbing/lines from MC to brakes. No visible leaks. Looked on floorboard below foot pedal and no leaks. Crazy! Anyone make a sugestion as to where so muc fluid could be going????
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Old 05-05-2010, 06:54 PM   #2
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brake fluid gnome?

maybe the system had a bunch of air in it and it's working it's way back to the master cylinder? Maybe drive it down a dirt road, all that dust if sure to stick to any fresh fluids.
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Old 05-06-2010, 12:28 AM   #3
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Brake Fluid Loss

it might be a leaky vacuum booster - the missing brake fluid might be getting sucked into the engine
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Old 05-06-2010, 01:18 AM   #4
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pull up the carpet and see if its leaking from the rear seal.
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Old 05-07-2010, 07:36 PM   #5
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I agree with socal, I had this happen to me. The brake fluid leaks out the back of the master cylinder and gets sucked into the intake through the booster and is burned in the engine. Took me a couple of months to find it.
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Old 05-07-2010, 07:59 PM   #6
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If your absoulutley sure its not leaking externaly then its prob around or in the brake booster. Did you do any brake work recently? If so and you had lines off and did not bleed the system alot of the air will work its way out and "seem" to consume fluid.
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Old 05-07-2010, 07:59 PM
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