66 Sat
Well-Known Member
My brakes are playing up. Car has a drum to disc conversion on the front, drums on rear, been driven for 2.5 years. no brake issues other than leaking wheel cylinders 6 months ago, all fixed.
Today driving in traffic and went to slow from maybe 10 mph but had no brakes and car felt like it was speeding up slightly. Pedal didn't sink to floor, just felt like no power assistance. Car did slow eventually (before I went up the rear of the car in front) and then lights changed to green. Brakes were normal for next 5 minutes until I parked at destination and I was thinking "did I hit half brake half throttle and that was the issue?"
Anyway, driving home again about half hour later had the same issue - hard-ish pedal but no power assistance and very little braking force, then a few seconds later back to normal. Managed to get home in one piece but obviously something is amiss. When it happens it will hardly even hold the car stationary at idle in Drive, which is a scary feeling.
Fluid level is fine in MC. Car runs normally except I thought the idle was higher than normal at times today, and last night driving home I was waiting at the lights and the idle seemed high, maybe 100 rpm higher than normal. Brakes were fine last night though. If the idle is intermittently high and it corresponds with the loss of brakes, then in Drive it would make the car feel like it was running away from me.
Can a vacuum leak be intermittent? If there was a leak in the brake booster could it be the cause of the high idle, or could the leak be anywhere and cause the issue with the brakes?
The booster is just one of those gold colored cheap ones that come with most of the conversion kits.
Today driving in traffic and went to slow from maybe 10 mph but had no brakes and car felt like it was speeding up slightly. Pedal didn't sink to floor, just felt like no power assistance. Car did slow eventually (before I went up the rear of the car in front) and then lights changed to green. Brakes were normal for next 5 minutes until I parked at destination and I was thinking "did I hit half brake half throttle and that was the issue?"
Anyway, driving home again about half hour later had the same issue - hard-ish pedal but no power assistance and very little braking force, then a few seconds later back to normal. Managed to get home in one piece but obviously something is amiss. When it happens it will hardly even hold the car stationary at idle in Drive, which is a scary feeling.
Fluid level is fine in MC. Car runs normally except I thought the idle was higher than normal at times today, and last night driving home I was waiting at the lights and the idle seemed high, maybe 100 rpm higher than normal. Brakes were fine last night though. If the idle is intermittently high and it corresponds with the loss of brakes, then in Drive it would make the car feel like it was running away from me.
Can a vacuum leak be intermittent? If there was a leak in the brake booster could it be the cause of the high idle, or could the leak be anywhere and cause the issue with the brakes?
The booster is just one of those gold colored cheap ones that come with most of the conversion kits.