Hey All,


It's been hot here for a few weeks and I notice my brake pedal is fully pumped until I start the truck and it normalizes. Having a few Chryslers makes me not worry too much but I'm open to thoughts.

 

Harv1000,

Is the issue intermittent, or is this condition happening on every start? Have you noticed any changes in brake performance?

Dave

 

If you are not having braking issues, I wouldn't worry about it.

 

if you are pumping the brakes with the engine off you are draining the vacuum reservoir for the power brakes, they will get stiffer as you use up that assist power, if your brake performance is normal when the engine is on I would not be concerned.

 

After I had the brake booster recall that is the norm on every start on my 2012 5.7 Crew and brakes work perfectly, so I would say no problem.


Auggie

 

Forgot pic. Did this pic work ?

 

Did this pic work ?

 

I have had this issue since the brake booster recall also. For those of you not understanding what OP is trying to explain:

When you park the DD overnight, the residual vacuum pressure should keep the brake pedal 'soft' for when you step on it in the morning to start the truck.

When I park my vehicle overnight, the residual vacuum pressure is lost and when you go to perform the first start in the morning, the pedal is rock hard and has little to no travel.

Once you start the truck, the vacuum boost is present and the pedal operates normally, as do the brakes.

There is obviously a vacuum leak, but not a leak obvious enough to locate and not enough to trigger a CEL.

 

I've had this issue also. I did take my DD in for the recall check, but no change was required. It seems to do it at random though and it doesn't do it very often.

 

I agree with coldsteel, there must be a small leak somewhere.

I could be the brake booster.