Question about 2003 Toyota Tacoma

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Warped Rotors? - I put a 2 inch lift, spacers in front & add a leaf in rear. - I have a camper shell (about 200lbs) - using stock rims and only one size up on tires about 32" The lift kit came with a bracket to lower the brake proportioner. When I added that the bracket the rear brakes would lock up or engage alot more with ABS due to the proportioner thinking their is a load in the truck. I moved the bracket about an inch up & a few months later the stock front rotors slowly warped. I replaced the rotors with upgraded ones & about a year later the rotors did the same thing. Is there a way to measure the proportioner position?

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  • Tom Hill Dec 11, 2009

    I have vented rotors now but I will check out the slotted rotors to keep them cooler. Thanks much



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In order to understand my answer you have to review the law of physics.

Force = mass X acceleration

F = M A

Quick refresher link HERE


You upgrade added weight and heighten the central of gravity.

Are you carrying any payload?


The higher CG is causing part of the problem and the additional weight will require higher negative FORCE -F to stop the truck.


The economical solution is to shop for VENTED ROTORS with 2 years warranty and good set of lifetime warranty Ceramic pads.

Change brake fluid to DOT4

Load-sensing proportioning valve (LSPV) is out there.


I would beef up the front brakes first before looking into Load-sensing proportioning valve.

Posted on Dec 11, 2009

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Not so much a way to measure the postion as there is a way to prevent the problem. before you installed the aftermarket components you could have measured the position while the vehicle was unloaded and made sure it remained in the same position after the kit was installed. you may have to try to modify (bend, adjust, or somehow malipulate) the bracket until you get the desired results, or you can try adjusting the rear brakes to be a little bit tighter if they are drum brakes to take some of the work load off of the front. there isnt an exact science to it because there are too many variables involved when a vehicle has been modified as in your case.

Posted on Dec 11, 2009


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2 Answers

Will 20 inch rims fit on a 1998 Nissan Pathfinder I ordered 2 inch spacers millimeter born the middle

it is illegal to use spacers behind rims as it puts excessive load on the wheel studs

if you want to run bigger wheels then get them with the correct offset so that spacers are not necessaey

Nov 04, 2015 | Nissan Cars & Trucks

2 Answers


Hello, Here is what you might try. First, go to and look at their tire comparison features on the Website. You will see "tools" that show what size tires will fit on your rims and what extra size rims will fit under your wheelwells. There is also a speed calculator for using the larger size tires over stock and it will show speedometer error if you do not recalibrate the speedo.

Next would be using spacers on the bottom of the springs or having longer springs refitted to your car. Finally air shocks front and back will give you some lift. The Grand Marquis can have rear air suspension, but to use it like you want, you will need to reconfigure the pump and change limit switches.

If you do all of this, you may reach your 4" lift. Your ride quality once you start changing springs and limiting travel in the suspension will probably deteriorate. As your car is a body on frame design, you may be able to put spacers of 1/2" to 1" under the body to frame mounts. You would need to make up the distance for the steering shaft, A/C lines and possibly hoses throughout.

In general, an inch from the tires, two inches from the springs or air shocks, and the balance from body on frame spacing.

I changed from the low 60 Series tires to a 65 Series tire on my own Grand Marquis. You can get a 70 Series to fit. I looked at Police car tires and they used 60 Series. But going back to 1994 Models, the 70 Series tire was available from the factory.

I hope my solution is very helpful to you in deciding what you to do.

Apr 22, 2011 | 2000 Mercury Grand Marquis

1 Answer

Front brakes drag (more on left than right) while driving in rush hour stop-and-go traffic. Both rims get hot the left more than the right. Also have some steering wheel vibration and brake pedal pulsing....

Sounds like the pads are completely worn or either crystallized. The crystallized happens when the brakes get hot and cool water hits them, this will also warp the rotors. With the brakes pulsating, it may be the rotors are warped and have worn the brake pads uneven. I would have the rotors checked when buying new pads and if they are warped, buy new ones. If their not warped to bad, sometimes these can be machined until even but you never know how much metal will be left on the rotor.

May 28, 2010 | 2003 Chrysler Town & Country

1 Answer

I want a body lift for my truck

Do you have 4WD? Usually they dont have very many lift kits for 2WD. All they can give you really is longer leaf springs or blocks in the rear, and spring spacers or taller springs for the front.
As for 4WD, they have the same fittings for the rear, but the front theres a different set up.

Feb 09, 2010 | 1991 Ford F350

1 Answer

I have a crunching sound coming from the front wheels when applying the brakes at a low speed and only after I drive the car a few miles

sounds like the pads have worn down, or there's debris between the pads & rotor. in my personal experience, the stock rotors from hyundai don't hold up very well. i replaced pads (front and rear) at around 45K miles, and had the stock rotors turned down. less than 1K miles later, the front rotors were already warped! there have been many complaints about hyundai's rotors, so i replaced mine with a set of raybestos rotors and also put ceramic pads up front. 20K miles later, they're still working great.

Feb 05, 2010 | 2006 Hyundai Sonata

1 Answer

Recently had front & rear brakes replaced along with a new rear axle. Vehicle has 114,000 miles. The brakes shudder slightly with normal braking + some quivering of the steering wheel. With hard...

Its a good idea to turn your rotors if your putting on new pads so that you get a good seat.  The steering wheel vibration may be your new pads wearing in and trying to find a good seat.  Give it another 500 miles for break in period and if you still get the problem, then replace the pads with better ones and check to see if your rotors are not warped.  Your pads will never seat correctly if your rotors are warped and make sure you use plenty of that shim goop they give you in the package before putting on the pads.

Nov 19, 2009 | 1999 Ford Econoline

1 Answer

When i put opn the breaks my van shimmeys like

Although "Rotors" would have been a good guess, the wheel bearings, ball joint and tie rods should all have been checked after the wheels were lifted off the ground. Also the Caliper Bolts and/or Bolt Guides should be checked to see if they are warped. Warpage could also cause shuddering.
Is there any shaking while at highway speeds (without the braking)? Then it could be an alignment issue.
A bald tire in the front is not helping is dangerous and illegal in most states. The small dent in the rim in the back is not safe either. This could lead to a catastrophic tire failure. You can hammer those back a little and make it safer.
Good luck!!

Nov 17, 2009 | 1996 Dodge Caravan

1 Answer

Tire size & Suspension confusion:

31x10.50r15s will rub the front fender while turning if you dont install either a suspension or body lift. Adding a leaf spring to the rear will not neccessarily raise the vehicle you must add a block to the spring seat to raise the height. However you can use 30x9.50r15 without any modification. Hope that answers your question.

Apr 08, 2009 | 1998 Ford Explorer

1 Answer

Shaking while braking

If you put new rotors on and used the old pads that could be your problem. You never put new rotors on, with out new pads even when the old pads look new. Also just because the rotors are new does not mean thery are not warped. I have done a lot of break jobs where i have had to take the rotors back off and had them turned because they were warped right out of the box.

Mar 28, 2009 | 1996 Oldsmobile Cutlass Supreme Coupe

1 Answer

85 cj 7

You said stock height, does that mean you have stock suspension aswell? If I were you I would install stiffer shocks all the way around and add or replace the stock front stabilizer bar with a stiffer one. You may also consider installing more rigid leaf springs in the rear.

Hope this helps

Sep 10, 2008 | 1983 Jeep CJ7

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