Question about 1998 Toyota T100

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My 96 t100 brake pedal just became very stiff and the check engine light came on (refrencing a code of a possible vacumm leak)any ideas?

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You have a vacuum leak for sure. It could be in the power brake booster, or the vacuum hose that feeds it. The reason your brakes got stiff is you lost your power brakes, so your next thing to do is to try to find your leak!

Posted on Nov 12, 2009

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As I understood,you had stiff brake pedal and the car on your attempt to start was not firing? and after 30 seconds it did? How the engine ran after the start? If I am correct stiffness on brake pedal,fault is either the check valve which is fitted inside the hose goes from the inlet manifold to the servo unit,stuck open and cause the engine have a vacuum leak . Or the servo unit itself stuck according to diaphragm move ability after the vacuum.If the brakes now are working as before and the engine as well,I suggest to remove the hose with the check valve inside test it and actually I recommend to renew it. It is for safety purpose,because this will happen even when you are in motion and God knows if you are in a speed and need sharp braking. Confirm first that it is the check valve or the Servo unit. Ask from an expert help.

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Normally mounted on the firewall under the hood, the booster shouldn't be tough to replace and appears to be a metal drum, often with the master cylinder assembly directly attached.

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Considering the random nature of the problem, I would try this several times to see if the resulting drop in pedal height is constant or not.

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Presuming you have NO leaks in the hydraulic system,it would be a bad brake master cylinder.What's happening is,the piston inside the master cylinder has rubber seals,and when the pedal goes to the floor,the master cylinder is leaking internally,past the rubber seals.If the brake booster was bad,the symptom would be an extrememly HARD,unresponsive,brake pedal,and the engine would idle terrible (vacuum leak).Good luck.

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