I've had this issue now for a couple months but it seems to be getting worst.
When braking at slow speeds, like in a parking lot, or slowly rolling up to a red light the brake pedal will go hard and there will be no braking. The truck just keeps moving forward until I pump it and push hard enough, then it jerks to a stop. The brakes work great when coming off a high way, or any slam tests I have done, but I am at the point where I am not comfortable to drive because I am worried I could hit someone at low speeds.
It seemed like this was brake booster related, like I had run out of vacuum assist either during long slow braking ( up to a red light) or when using the brakes a second time without giving the vehicle any gas (coasting around in a parking lot)
Checked for vacuum leaks and replaced some suspicious lines with no change.
Replaced the check valve at the booster with no change
bleed brakes a couple times, I am not a rookie mechanic so I'm pretty confident this isn't the issue unless there is air trapped in the abs controller or something odd like that.
So I am down to thinking new booster is required, or maybe master cylinder. My other thought is could something be acting up with my rear drums. I have never replaced a cylinder back there. Any tricks to diagnose these parts?
Looking for some opinions/advice before throwing new parts at it.
Thanks
When braking at slow speeds, like in a parking lot, or slowly rolling up to a red light the brake pedal will go hard and there will be no braking. The truck just keeps moving forward until I pump it and push hard enough, then it jerks to a stop. The brakes work great when coming off a high way, or any slam tests I have done, but I am at the point where I am not comfortable to drive because I am worried I could hit someone at low speeds.
It seemed like this was brake booster related, like I had run out of vacuum assist either during long slow braking ( up to a red light) or when using the brakes a second time without giving the vehicle any gas (coasting around in a parking lot)
Checked for vacuum leaks and replaced some suspicious lines with no change.
Replaced the check valve at the booster with no change
bleed brakes a couple times, I am not a rookie mechanic so I'm pretty confident this isn't the issue unless there is air trapped in the abs controller or something odd like that.
So I am down to thinking new booster is required, or maybe master cylinder. My other thought is could something be acting up with my rear drums. I have never replaced a cylinder back there. Any tricks to diagnose these parts?
Looking for some opinions/advice before throwing new parts at it.
Thanks
