At seemingly random times I will go to push the brake pedal only to find that it wont budge. Most often the resistance wont last more than a second or two but I have on rare occasion had to use the emergency brake to slow down. Usually air in the line manifests itself as 'squishiness' - is it possible for air to produce the symptoms I'm describing? Perhaps more likely is a faulty master cylinder? Any ideas?
Thanks, Jonathan
The problem you have is most likely the brake booster control valve - more precisely, the reactor disc cracked. A replacement booster is usually the best cure unless you have expertise in booster rebuild. If the vehicle is high mileage, a master cylinder at the same time would also be a good idea because any debris in the MC may become dislodged causing problems after the booster is replaced and become fully functional.
Lugnut
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