Question about 1999 Mercury Grand Marquis

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Do i have steel or phenolic pistons? - 1999 Mercury Grand Marquis

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Other than looking at the Calipers you can try to check your Vin#. The Vin# will show the options. The performance and copcar and taxi options used the steel pistons.

The Codes on the Doorplate will show Axles and some Trim options too. Some of the Chilton's Manuals show the breakdown for this code. It is possible that Autozone or other parts stores can reference the Vin#. The Dealer can for sure.

There is a difference in the size of Clips on the inboard pad. They are not interchangable. You can buy both sets and take the wrong set back, then you are covered either way.

Posted on Sep 30, 2010

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Where is the piston o ring


The term "o-ring" usually is in reference to some sort of rubber or neoprene ring that serves as a gasket or seal for something. Pistons do not have o-rings, but they do have piston rings. There are usually three or more rings on each piston. They are split rings of steel that are inserted into grooves of the outer circumference of the piston. They seal the piston to the cylinder walls and prevent the air/fuel mix from getting past the piston into the crankcase and prevents the crankcase oil from being sucked into the cylinders. With the pistons rings, the cylinders would not have sufficient compression to do their job effectively. Rings can and do break from time to time. This can cause degradation of performance or in the worst-case scenarios, serious cylinder damage.



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Feb 14, 2016 | Cars & Trucks

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What would cause both front brakes to lock up?


sticking disk brakes are caused by rust that forms on piston ,and brake drags and heats up making it tighter and tighter till finnaly no movement is allowed, till it cools off

the awnser to this is to use a Non factory (aftermarket) caliper( bembo) with a non steel piston and cross drilled rotors or don't let your steel calipers rust by keeping car in heated/ dry garage !

Aug 28, 2014 | 2004 Ford Mustang

1 Answer

To change brakes does the piston just push back in


yes it does. i put a thick piece of flat steel across the piston and use a C-Clamp to compress it. some people just put the C-Clamp inside the piston but in either case the clamp really makes it easier.

Jun 14, 2011 | Toyota RAV4 Cars & Trucks

1 Answer

Brake fluid is expelled from the top cover of master cylinder when brake pedal is depressed why?


Brake fluid from the Master Cylinder leaks if the Master Cylinder is leaking itself otherwise the leak is somewhere else, have some one check this out, it could be anywhere and you should have seen some drops on the floor by now.

Sounds like a "stuck" caliper piston. Many Chrysler products (by example) used "phenolic" pistons in the calipers which were notorious for seizing in the caliper. Replacement pistons are usually made of steel. With the piston seized heat builds up and ruins the seals in the caliper.

You could have a blown master cylinder that is leaking from the back and into the booster area. Take the cylinder loose from the booster and see if there is fluid in that cavity. Sounds like a massive leak. Look at the rubber hoses and metal lines. The reason you cannot pump up the brakes is because the leak is allowing air to re-enter the system so that pressure cannot build up.

Also, this article could help to check it: how-to-fix-a-brake-fluid-leak

I hope helps (remember to rate and comment this).

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Need to know what size allen wrench to take off front disc brakes on 2000 chevy silverado 4.8 l


The caliper guide pins will usually have either a 3/8 inch or a 5/16 inch allen head bolt. If the brake calipers are found to have phenolic pistons then it would be advisable to change them with calipers that have metal pistons.

Sep 21, 2010 | 2000 Chevrolet Silverado 1500

1 Answer

What kind of Rear brakes does a 2001 Grand marquis have? phenolic piston or steel? Also is it pads or shoes?


The rear brakes are rotors for the service brakes and an internal drum for the Emergency brake. So you will need pads for the driving(service) brakes and shoes for the Ebrake.

Whether you have phenolic(plastic) caliper pistons or steel depends on the options your car has. The heavy service calipers use steel. These are for Police, Taxis, and Performance options. Have your VIN# handy. In some years the driveshafts were bigger too!

The pads have clips on the back of them. The clips are different sizes for the phenolic or steel pistons. I have a 2002 Grand Marquis LSE and it has the heavy duty parts for the performance version. Remember new brake hardware. When in doubt, get both types of pads and return the extras. If you are getting the rotors turned, jack both sides and make your decision about pads when you remove them.

The E-brake drum surfaces inside the back of the rotors for the rear brakes usually always corrode and can't be turned. Good Luck

Apr 04, 2010 | 2001 Mercury Grand Marquis

2 Answers

Compress FRONT Caliper on 2008 Town Country


You can compress the piston with a simple C-clamp. other than youre basic tools you will be okay nothing special required.

Dec 17, 2009 | 2008 Chrysler Town & Country

1 Answer

I have a 2000 Mercury Grand Marquis and I'm trying to purchased the rear brake pads, but I don't know which ones to buy for my vehicle. What's the difference between a phenolic piston and steel piston....


What they are referring to is the caliper pistons. The phenolic should be plastic. You need to know what type of pistons your car has because there is a difference in the clips on the linings.

I also would recommend you to inspect the emergency brakes and if you are planning to keep your car the ceramic brakes are expensive but really quiet and no brake dust.

Nov 05, 2009 | 2000 Mercury Grand Marquis

1 Answer

Help-Ford E-350 Brake problem


First, if the recall applies to your van, it can be done anytime. There is no time limit on recalls. Call your dealer with your 17 Digit VIN number and they can check. Please rate as solved if this is what you need. thanks.

Here is the recall:

Safety Recall 92S44 - Certain 1988-1991 F250/350 Trucks for Loss of Front Brake Effectiveness
Affected Vehicles
Certain 1988-1991 F250/350 trucks over 8500 lb GVW with 7.5L EFI or 7.3L diesel (4x2 and 4x4) and 5.8L EFI (4x4 only). Trucks under 8500 lb GVW. 5.8L EFI (4x2) and F-Super Duty light trucks are not involved in this recall. Specific vehicle information is as follows:

AFFECTED VEHICLES ASSEMBLY PLANT PRODUCTION DATES F250/350 Norfolk Job#1 1988 to 4/18/91 Kansas City Job#1 1988 to 4/25/91 Ont. Truck Job#1 1988 to 5/1/91 Mich. Truck Job#1 1988 to 5/11/91 Twin Cities Job#1 1988 to 5/29/91
Reasons For Recall
In certain extremely severe driving conditions, the vehicle may experience a loss of front brake effectiveness due to overheating of brake fluid. These vehicles have a split brake system and the rear brakes remain operational. This condition has been reported primarily in vehicles operated in mountainous regions, and on vehicles that have been in service for a minimum of one to two years and where the brake fluid has absorbed moisture from the air, lowering its boiling point. It usually involves heavily loaded vehicles driving on long, steep grades, or when towing at, or near, the Maximum Gross Combination Weight Rating (GCWR) for towing. Warm weather also appears to contribute to this condition. To correct this condition, dealers will install insulators in the front brake caliper pistons on all the affected trucks. 7.5L EFI engine equipped trucks will also have insulation installed on selected portions of the front brake lines.
-----------------------------------------------------------------------------------------
PART NUMBER DESCRIPTION CLASS DEALER PRICE F2TZ-2C361-A Kit-Brake Caliper Piston Insulator (All Except 7.5L Engines) BG F2TZ-2C361-B Kit-Brake Tube Insulator Jacket (Required Only For Vehicles Equipped With 7.5L EFI Engines) Kit Also Includes Brake Caliper Piston Insulators

Brake Caliper Piston Insulator Kit
Installation Instructions
  1. Remove the front wheel and tire assemblies.
  2. Remove the brake calipers from the rotors. Refer to the appropriate shop manual for the procedures.
  3. Remove the inner and outer brake linings.
  4. Inspect the brake caliper pistons. If the pistons are phenolic, (brown in color) no modifications are required. Reassemble the calipers as described in the shop manual. If the truck is equipped with a 7.5L EFI engine, install the brake tube insulator kit. If the truck is not equipped with an 7.5L EFI engine, install the wheels and tires and release the truck.
    If the pistons are aluminum, continue as described below.
  5. Remove the steel retainer and Nomex thermal washers from the kit.
  6. Place a steel retainer on a bench with the tabs facing up. Refer to Figure 1.
  7. Place a Nomex thermal washer over the tabs so that it rests on the barb of each tab. Then, carefully press it over the barb of one of the tabs. Repeat the procedure for each of the remaining tabs.

    • NOTE:
      Do not bend the tabs. The inner edge of the washer may crease slightly as it passes over the barb. This is permissible provided that the crease can be smoothed out once the washer is in place. The washer must be installed without tearing.

  8. Push the washer down onto the back face of the retainer. Be sure it is seated uniformly on the retainer. Once installed, do not use an adhesive or other aid to hold it in place. This is neither necessary nor permissible.
  9. Snap an assembled insulator into the inside diameter of each caliper piston. Be sure the assembly is firmly seated on the rim of the piston. See Figure 2.
  10. Install the inner and outer brake linings.
  11. Clean the caliper slide surfaces on the caliper and the spindle with a wire brush and lubricate with Disc Brake Caliper Slide Grease, D7AZ-19590-A (ESA-M1C172-A) or equivalent.
  12. Reinstall the brake calipers. Refer to the appropriate shop manual for the procedures.
  13. Install the wheel and tire assemblies.

May 25, 2009 | 2007 Ford E-350 Super Duty Length XLT

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