Full throttle run, then stiff brake pedl?

[faster7581]

I've noticed on my truck lately, that if I do a full throttle run, then let off and brake, the pedal is real stiff for a few seconds, then it go back to normal.. Is this normal, or do I some kinda issue with brake/boost? Btw it does it on 210 tow, 275, 300 and 310 Spartan.
Thanks
Mike B

 

[Rmartin-97]

I've noticed on my truck lately, that if I do a full throttle run, then let off and brake, the pedal is real stiff for a few seconds, then it go back to normal.. Is this normal, or do I some kinda issue with brake/boost? Btw it does it on 210 tow, 275, 300 and 310 Spartan.
Thanks
Mike B

Does it do it if you floor it from like 50 or 60

 

[faster7581]

i'll check, but pretty sure its anytime I lay into for a few seconds then let off and brake

 

[Rmartin-97]

It could ne tryin to spin a little and the abs is makin the pedal stiff.

 

[faster7581]

its after I let off the throttle, and apply the brake, light or heavy brake pressure.. the pedal is real stiff and stays high, then after a few seconds, the pedal feels normal and braking is normal... its done it at the end of the track @100mph, so its def not spinning.

 

[whitetailreflex]

Had the same problem in mine with idp extreme x. Makes the hiney pucker for sure! But I started turning traction control off habitually and I wanna say it stopped

 

[faster7581]

I don't have traction control, and yes definitely puckers the hiney... would suck on the road if someone pulled out in front of me..

 

[whitetailreflex]

I don't have traction control, and yes definitely puckers the hiney... would suck on the road if someone pulled out in front of me..

Had that happen once. Wasn't pretty at all, thought I broke my pedal I pushed so hard

 

[Big Angry Hillbilly]

Power steering pump probably can't hack it at high rpm.

 

[Dzchey21]

Power steering pump probably can't hack it at high rpm.

This is correct

 

[whitetailreflex]

Power steering pump probably can't hack it at high rpm.

Never even thought of this

 

[faster7581]

power steering pump? whats that have to do with braking? I'm new to the 6.4, sorry :shrug:

 

[Big Angry Hillbilly]

Hydraulically assisted power brakes.

 

[OBS F350]

Mine did the same, I always figured it was the P/S pump being angry about the high rpms LOL. Plus mine was getting weak already.

 

[7.3powerstroke00]

Mine has done this ever since I tuned it 25k or so miles ago, usually if it does give me the stiff pedal I can let off the brake a little and then put pressure back an it's normal... I'm pretty sure it's the abs system gettin confused because your going straight from hard acceleration to trying to stop so it kicks in.

 

[faster7581]

that's what I've been doing, just ease up on the brake for a few seconds then get back on it and its back to normal.... thanks for the replies, guess its normal with big tunes.

 

[Mike@MPD]

If i spin really bad i will get the same thing, never got it going down the track though