change the bearings.
Could be a warped hub too.

if you want to actually diagnose it, get a magnetic or clamp on dial runout gauge and measure it with everything put together.

 

Thank You for your reply, I am just thinking that I will take the whole system off of my lifted 94 and see if that solves the problem. From there, if the pulsation goes away I won't even hesitate to go get new bearings and hubs. I was also thinking (and chime in on this) it may be the booster as well. I know thats least likely but you never know.

 

How about simply re-torquing the adjusting nut on the hub first? Should eliminate any play you might have in the hub and bearings due to wear. Might save you from tearing everything apart.

 

Hey FourWD1, Thanks for the advice but I've actually already done that not once but atleast 3 times once when I put the first rotors, then the second set, and then resurfaced the second set and put them in again (All the sets of rotors I mentioned are brand new Duralasts purchased from Autozone.) Even used the 54mm socket (hard to find) rather than any old school method of taking that adjusting nut out. I am planning on tackling this problem tomo if it doesn't get too cold or rainy. I will keep everyone informed as I'm sure one day this thread may come in handy for someone else out there.

 

54mm socket (hard to find)

FYI, 54mm = 2 1/8".

 

Thanks Dirty Dude, I ended up buying the socket off fleebay waited 4 days and was back in business. If anyone is intereseted this is the term you need to search "54mm Toyota Hex Wheel Bearing Locknut Socket"

 

You can pick up 54mm sockets really cheap at Harbor Freight. Normally I would never buy something from there, but lets be honest how many times would you use it?

 

Have we ruled out tires and wheels here? A warped wheel or bad tire can easily cause what feels like a brake pulse.

 

Ok guys I have been very busy but finally had time this week and last. As Zembonez said have I ruled out bad tires or wheels etc. Well the tires were under warranty still thru Discount tire so I had them checked and balanced and rotated. However that did not solve the problem.

So finally I took on the hard task to determine if my bearings were bad. Well like I said earlier I had planned on taking off the whole front assembly's which includes rotor, hub & bearings from both front sides of my 94 lifted pickup and put it on my 91 pickup, which is the truck with the problem. Well sad to say the problem was still there and pulsated the same way as it did with the bearings hubs and rotors that were originally already on there. So from that I concluded my bearings hub etc should be good as I dont have this problem on my lifted truck.

Any ideas where else to look at would be greatly appreciated. I have looked into this problem and even gone in the extent to search in the 4runner and Toyota Pickup sections of many forums found thru Google search. It seems people who do have this problem dont really post back with thier solutions. So thats a bummer right there. So I'm here hoping for a solution. )

 

Check the calipers? Hows the wear on the pads?

 

Hey Hoe_Nah the Calipers, Rotors, Brake Pads, Rear Shoes & Rear Cylinders All have less than 100 miles. Wear on the brake pads and Rotors are as normal as it can be. All of these things were replaced due to the brakes pulsating to begin with and still did not cure the problem. Then went back and got another set of new rotors and had them resurfaced (figured why not maybe they might be sitting on the shelf to long) and put new pads and new shoes again and this time new drums to go along with it and that still did not solve the problem. Kinda starting to become a really painful task esp. when doing it by myself and time being an issue but I plan on keeping this truck as we are still the original owners

 

Just throwing out random ideas as it comes to me....maybe a kinked line?

 

Nah not a kinked line. Something weird just came to mind and I went outside and decided to test my hypothesis about 10 mins ago. I decided to pull the rear anti lock fuse out under the steering wheel. Did it solve the problem of pulsating brakes? Yes it did indeed. And now I'm back here posting back to your reply. However, now it's a whole new mission and that is fixing the rear antilock problem as I would like to retain that feature. Any ideas what it could've been that made it do that. Im already researching on how to fix that issue, I will post the answer for that as well when I find the solution. I really do hope this thread helps out someone out there. If it does comment back.

Update: So far based on research its pointing to the speed sensor in the rear differential. Ill see how that goes and get back if any more ideas please comment. Thanks Guys.

 

Maybe the sensor went out? Top of rear diff is where it should be located...

 

My apologies on replying so late but you are right hoe_nah it was the sensor located on the diff. Also if anyone has similar problem start with the simplest method first that may slip everyones mind. Take out the rear antilock fuse out. Its is located in the driver side fuse box close to the clutch pedal.