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

52,795

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 out of 1 people think this is helpful.

this happens when sitting still in park

52,795

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?

17,870

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?

17,870

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

17,870

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

17,870

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.

17,870

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

17,870

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 27,669 nationwide Tahoe listings starting at $600.

ZIP:

Search Chevrolet Tahoe Questions

Chevrolet Tahoe Experts

#1 Tom Demyan
Tom Demyan
Reputation 740
#2 Rowefast
Rowefast
Reputation 690
#3 Lucia Taylor
Lucia Taylor
Reputation 430
View All

Related Models For Sale

Used GMC Yukon
410 Great Deals out of 16,308 listings starting at $1,800
Used Chevrolet Suburban
384 Great Deals out of 18,620 listings starting at $2,395
Used Cadillac Escalade
259 Great Deals out of 10,591 listings starting at $1,490
Used Chevrolet Silverado 1500
1,978 Great Deals out of 160,605 listings starting at $1,850
Used Ford Expedition
389 Great Deals out of 24,310 listings starting at $2,400
Used Ford Explorer
758 Great Deals out of 74,253 listings starting at $750
Used Ford F-150
2,390 Great Deals out of 209,711 listings starting at $895
Used Jeep Grand Cherokee
844 Great Deals out of 70,155 listings starting at $700
Used Dodge Durango
248 Great Deals out of 22,858 listings starting at $1,499
Used Toyota 4Runner
279 Great Deals out of 20,422 listings starting at $2,700
Used GMC Yukon XL
262 Great Deals out of 11,816 listings starting at $2,400
Used GMC Sierra 1500
897 Great Deals out of 64,571 listings starting at $1,500

Used Cars For Sale

2017 Chevrolet Tahoe For Sale
13 Great Deals out of 10,318 listings starting at $34,351
2016 Chevrolet Tahoe For Sale
72 Great Deals out of 2,854 listings starting at $31,448
2015 Chevrolet Tahoe For Sale
33 Great Deals out of 2,032 listings starting at $27,995
2014 Chevrolet Tahoe For Sale
25 Great Deals out of 694 listings starting at $12,795
2013 Chevrolet Tahoe For Sale
57 Great Deals out of 1,586 listings starting at $11,500