Brake pedal kickback

[rickf]

I have an issue that appears mostly when cold but it is getting more frequent. If I hit the brakes even halfway fast the pedal will kickback at me and then go down. In really cold weather I can feel this action in the steering also which leads me to believe it may have something to do with the pump. I bought this truck a couple of years ago and the brakes have always had a lag on releasing. The light will stay on for a couple of seconds after releasing the pedal so I just wanted to get some opinions. I have the usual wander on the highway and I figure I am going to have to replace the box at some point but I do not think this is part of that issue. This is a TWO wheel drive truck. I add that in because everyone always assumes all these trucks are four wheel drive when they give a diagnosis.Rick

[Mopar1973Man]

Still its a all wheel ABS system. This kickback is because a single front sensor is off most likely slower and the ABS module is wanting to prevent lockup so the pump fights you till it errors out and trips the light. So I would suggest that you replace both front sensors.

Because you not complaining of speedometer issues so I'm going to assume its one front sensor.

[rickf]

No ABS light or codes and it is a different feel. This is right at the top of the pedal travel, not down low where the brakes are actually activated. Plus I don't think the anti-lock would be felt in the steering.

[hex0rz]

Maybe the vacuum pump or hydroboost?

[rickf]

Vacuum pump? I don't understand where the vacuum pump would come into play.The more I think about it the more I suspect the hydroboost. I have had the issue with the slow return on the pedal for years and now this. The pump would not affect the pedal return but the hydroboost could so now............ who has the best prices on a QUALITY hydroboost unit?Rick

[Mopar1973Man]

Vacuum pump? I don't understand where the vacuum pump would come into play. The more I think about it the more I suspect the hydroboost. I have had the issue with the slow return on the pedal for years and now this. The pump would not affect the pedal return but the hydroboost could so now............ who has the best prices on a QUALITY hydroboost unit? Rick

That does sound like your on the right track. You could rebuild it yourself. http://articles.mopar1973man.com/general-cummins/33-brake-system/79-brake-hydrobooster-rebuild

[Wild and Free]

Have you replaced a hub or front sensor recently? This is what my 02 did when I replaced 1 front sensor with a non OEM, it reads differently than the OEM, I had to swap out the other sensor and it cured my problem which was exactly as you describe yours is doing.

[rickf]

Haven't touched the front end in a year. Like I said, I think that combined with the issue I have had for over a year of the slow pedal return this push back problem is just telling me it is time to rebuild the booster. I really need to find out if it is the same part number as a one ton Chevy from the eighties. I already have two of them on the shelf.Rick