Phill's pulsations

[John Hofstetter <hofs@domain.elided>]

>From: "Phillip L. Knapp O.D." <plknapp@domain.elided>
>Subject: Brakes...No pedal pulsation, but 74IH "pulsates" with braking
>
>Hey List,
>
>I've got a '74 IH 4x4 pickup with disc in front and drum in back... 
>when I hit the brakes the pickup "pulsates". That is to say it's like 
>the brakes are being applied and then realeased very quickly... I 
>get the feeling that it could be the rear drums out of round.. but I've 
>never had this type of brake symptom before.... I also thought it 
>could be something crazy with the vaccuum canister for the power 
>brakes, the pickup had a bad intake valve (bent pushrod) so I 
>though fixing that would fix the pulsating brakes too... but no such 
>luck... any ideas?
>
>Phill

Phill,

I think you're experiencing one of two things:
You have ABS brakes and didn't know it, or
Your rotors on the front brakes are warped and need to be turned.

My guess is that it is more likely the latter.

John Hofstetter