Carlson Disc Brake Caliper Piston
Carlson Disc Brake Caliper Piston

Carlson Disc Brake Caliper Piston P/N:7939

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$24.99
MPN: 7939
Item Package Quantity: 1
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Carlson Disc Brake Caliper Piston P/N:7939
Carlson Disc Brake Caliper Piston P/N:7939
$24.99

Turn brake-line pressure into clamping force with the Carlson Disc Brake Caliper Piston 7939. This front caliper piston uses brake fluid pressure to force the brake pads against the rotor, and it installs as a direct-fit replacement for the 1998-2007 Lexus LX470, 1998-2007 Toyota Land Cruiser, 2010-2022 Lexus GX460, and 2010-2022 Toyota 4Runner (all engines).

  • Core brake hardware: harnesses brake fluid pressure to press the pads against the rotor as part of the caliper assembly.
  • Steel construction: made from steel and corrosion-resistant against harsh road conditions.
  • Sized to spec: 1-1/2 in (37.5 mm) diameter and 1-1/4 in (31.5 mm) height.
  • OE-quality: matches Original Equipment (OE) quality specifications.

Brake systems work as a set, so brake service experts recommend refreshing the caliper hardware whenever the friction material is replaced. This listing is for one piston; the number required varies by application — the Lexus GX460 and Toyota 4Runner use 8, while the Lexus LX470 and Toyota Land Cruiser use 2, so order to match your vehicle. Country of origin: China.

Interchange: FH7939. Manufacturer part number 7939.

This part cross-references / interchanges with the following part numbers:

7939, FH7939

Frequently Asked Questions

What does the Carlson 7939 caliper piston do?

It's a front disc brake caliper piston that uses brake fluid pressure to force the brake pads against the rotor. If a seized, scored, or corroded piston is the cause of your brake trouble, this replaces it.

What vehicles does the 7939 fit?

It's a direct-fit replacement for the 1998-2007 Lexus LX470, 1998-2007 Toyota Land Cruiser, 2010-2022 Lexus GX460, and 2010-2022 Toyota 4Runner (all engines). See the Buyer's Guide tab for details.

What is the piston made of and what size is it?

It's steel and corrosion-resistant, measuring 1-1/2 in (37.5 mm) in diameter and 1-1/4 in (31.5 mm) in height, and it meets OE quality specifications.

How many pistons do I need?

This listing is for one piston, and quantity varies by application. The Lexus GX460 and Toyota 4Runner use 8, while the LX470 and Land Cruiser use 2. Order enough to match your vehicle.

Is this a front or rear caliper piston?

It's a front caliper piston. Since brake hardware wears along with the friction material, it's good practice to replace it when you service the pads.

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