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Re: Bad Master cylinder or Brake Booster? 96 S10 Blazer
Is brake light on? A stuck proportioning valve will set the brake light on. You can also force a reset of valve by removing either end caps and pressing the proper direction to center it.
A constant hissing is a bad vacuum booster.
Sometimes when brakes get a leak- the pedal goes down, which also puts the master cylinder plunger in an area it has never been before- longer stroke- and now the corroded plunger has worn/torn the o-rings and caused an internal leak. This is why when ever I bleed the brakes- I put a 2x4 behind brake pedal- to keep the plunger in the master cylinder in its previous working range- before the brake leak.
Just some thoughts.
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Automotive A/C Engineer with:
'99 IH 4700 Toy Hauler
(2) '95 GEO Prizms both maroon
'99 GMC Yukon
'95 Chev 3500, 454 Dually Crew Cab- 145k miles-
Wife's Camel trailer puller.
'94 Astro- 370k miles
'94 Firebird Formula- 5.7L 180k miles- gone-
'92 Chevy Lumina Van 3.8L 264k
'86 GMC S-15 - 2.8L 154k
'87 Buick Park Ave . 187k
'86 Buick Park Ave 3.8L 199k miles- gone
'77 Chevy Vega- 2.5L 175k miles gone but not forgotten
'68 Camaro 396 4 spd RS/SS -72k miles-
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