is there a reason why when pressing on the brake somewhat hard and then let off you can feel the engine rev just a little

Asked by Nov 23, 2015 at 02:13 PM about the 1999 Chevrolet Tahoe 2 Dr LT 4WD SUV

Question type: Maintenance & Repair

17 Answers

60,655

What you are seeing may just be the transmission down shifting. The brake booster uses engine vacuum which may account for the slight temporary increase in engine speed.

1 of 1 people found this helpful.

this happens when sitting still in park

60,655

Then I would suspect it is just the result of using up some engine vacuum for the brake booster.

would this have anything to do with the gear selector not going from park to drive.i replaced the master cylinder and brake booster. after I bled the system I started the truck up and noticed I left brake booster vacuum off. I put it on and then I was not able to shift from park..any ideas on this?

18,550

There is a check valve between the vacuum hose and the brake booster this valve is supposed to close off when brakes are applied to keep air from going back into engine causing the problem that you are having. Valve maybe stuck open letting air back into the engine.

thanks i'll check it out

thanks firebird,but the new check valve I installed didn't fix my problem. any other ideas?

18,550

The only other thing I can think of is you are loosing to much vacuum when brakes are applied. Start vehicle and have someone apply brakes listen under hood close to brake booster making sure there is not a vacuum leak anywhere.

thanks i'll give that a try after holiday. happy holiday to you and family

I tried applying the brakes,could not hear a leak.i also had them pump the brakes look like the booster was breathing.i guess that's normal. anything else you can think of.

firebird338 I had someone apply the brakes,could not hear a leak.i also had them pump the brakes it made the booster look like it was breathing,it that normal. anything else you can think of would be most helpful.thanks in advance

18,550

Why was the reason you changed out the master cylinder and brake booster ? Did you have this problem before replacing these parts ?

18,550

Question does your brakes go half way or all most to the floor before stopping ? If so here is one more thing you can try then after that I really do not know. Check to see if the brake rod ( the rod that goes between the brake pedal and the master cylinder ). See if it has an adjustment on it. If so adjust out by doing this it will take less air from the booster when brakes are applied. If brakes are going close to floor before stopping when brakes are applied hard taking to much air from booster at one time and engine is revving up trying to make up the difference. By doing what I suggest above may help. Hope this information helps.

18,550

To check to see if you have a adjustable brake rod remove master cylinder and turn rod that pushes it in if it is adjustable it will turn line a screw and you will be able to see screw treads on rod.

firebird338 thanks again. I'll try it. bleeding the system again o my.is there any way to tell how far to let the rod out? I didn't have this problem before. when I applied the brakes I could hear air leaking,so I replaced booster and the master since I had to remove it

18,550

Do you still have your old brake booster ? If so measure the rod length from it and adjust the new one to the same length if not you will just have to keep adjusting until the brake pedal feels right.

firebird338 when you get a chance can you give me a call. 301 332 0954

Your Answer

Add photo

Related Questions

Tahoe

Looking for a Used Tahoe in your area?

CarGurus has 29,234 nationwide Tahoe listings starting at $1,699.

ZIP:

Search Chevrolet Tahoe Questions

Chevrolet Tahoe Experts

#1 Tom Demyan
Tom Demyan
Reputation 800
#2 Rowefast
Rowefast
Reputation 780
#3 Lucia Taylor
Lucia Taylor
Reputation 490
View All

Related Models For Sale

Used GMC Yukon
377 Great Deals out of 18,226 listings starting at $2,950
Used Chevrolet Suburban
321 Great Deals out of 19,720 listings starting at $2,000
Used Cadillac Escalade
238 Great Deals out of 11,197 listings starting at $2,495
Used Chevrolet Silverado 1500
1,716 Great Deals out of 175,751 listings starting at $1,250
Used Ford Expedition
473 Great Deals out of 24,887 listings starting at $700
Used Ford Explorer
946 Great Deals out of 72,518 listings starting at $1,000
Used Ford F-150
2,195 Great Deals out of 206,316 listings starting at $1,499
Used Jeep Grand Cherokee
1,026 Great Deals out of 74,887 listings starting at $750
Used Toyota 4Runner
252 Great Deals out of 20,494 listings starting at $1,800
Used Dodge Durango
273 Great Deals out of 22,704 listings starting at $1,200
Used GMC Yukon XL
235 Great Deals out of 12,302 listings starting at $2,950
Used GMC Sierra 1500
825 Great Deals out of 68,199 listings starting at $2,484

Used Cars For Sale

2017 Chevrolet Tahoe For Sale
18 Great Deals out of 12,539 listings starting at $34,398
2016 Chevrolet Tahoe For Sale
54 Great Deals out of 2,461 listings starting at $31,449
2015 Chevrolet Tahoe For Sale
38 Great Deals out of 2,054 listings starting at $28,500
2014 Chevrolet Tahoe For Sale
19 Great Deals out of 644 listings starting at $11,995
2013 Chevrolet Tahoe For Sale
37 Great Deals out of 1,409 listings starting at $12,700

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.