Mountaineerfan 44 Report post Posted September 15, 2022 Symptoms: When driving, SOMETIMES when I press on the brake the pedal is hard to press (it will stop just like manual brakes, though). If I take my foot off for a second and then reapply, they work perfectly fine as power brakes should. Do I have a vacuum leak somewhere? Could it be the booster? Quote Share this post Link to post Share on other sites
det0326 179 Report post Posted September 15, 2022 The first thing I would check is the check valve where the rubber hose connects to booster. Also I had a vacuum booster once that leaked around the push rod shaft (the one between the booster and M/C} that caused the booster to function erratically sometime it sealed off and other times when you pushed the petal and released it wouldn't . 1 JayEstes reacted to this Quote Share this post Link to post Share on other sites
Mountaineerfan 44 Report post Posted September 15, 2022 Thanks! Do you have a procedure for checking that valve? Obviously removing the hose.... Quote Share this post Link to post Share on other sites
det0326 179 Report post Posted September 15, 2022 No procedure really, since it seems to be an intermitting issue the only sure way to tell would be to just replace the check valve. The way u described it tho u do have a leak somewhere. Have u noticed an increase in the engine idle recently, that is a sign of vacuum leak. Quote Share this post Link to post Share on other sites
Mountaineerfan 44 Report post Posted September 15, 2022 No, I haven't had a change in idle. I'm thinking about that valve: I'm assuming it's easy to replace? When I come to a stop sign, I have to double tap the brakes, so that's leading me to think check valve. Time for research! EDIT: Yep, easy to replace and $7 from Autozone. I'll try the cheap trick first! Quote Share this post Link to post Share on other sites
JayEstes 172 Report post Posted September 18, 2022 Mine was cracked and it wasn't all obvious it was until I tried to pull it out of the booster, and it broke. Make sure you get the right size hoses to go with it. It should go from the booster into the main vac port on the back/top of the engine. This hose is very important to overall vacuum, as it is a larger size, and leaks have a big effect. It won't cost you but a little more to get the hose replaced. 1 Mountaineerfan reacted to this Quote Share this post Link to post Share on other sites
Mountaineerfan 44 Report post Posted October 17, 2022 UPDATE: Replaced the check valve ($8 at AZ). Totally revitalized my braking response! Always check the cheap easy repair first! 3 rwcstang, Mach1 Driver and SWPruett reacted to this Quote Share this post Link to post Share on other sites
