Dorman - First Stop Brake Master Cylinder M630121
Dorman - First Stop Brake Master Cylinder M630121 - view 2
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Dorman - First Stop Brake Master Cylinder M630121
Dorman - First Stop Brake Master Cylinder M630121 - view 2
Dorman - First Stop Brake Master Cylinder M630121 - view 3
Dorman - First Stop Brake Master Cylinder M630121 - view 4

Dorman - First Stop Brake Master Cylinder P/N:M630121

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$172.99
MPN: M630121
Item Package Quantity: 1
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Dorman - First Stop Brake Master Cylinder P/N:M630121
Dorman - First Stop Brake Master Cylinder P/N:M630121
$172.99

Turn brake-pedal force into the hydraulic pressure that operates the brakes with the Dorman - First Stop Brake Master Cylinder M630121. It installs as a direct-fit replacement for the 2002-2003 Lexus ES300 and 2002-2003 Toyota Camry, feeding pressurized brake fluid to the hydraulic circuits when you press the pedal.

  • Core function: Converts the mechanical force from the brake pedal into hydraulic pressure that actuates the vehicle's braking system.
  • Direct-fit application: Designed to replace the master cylinder on the listed Lexus and Toyota applications.
  • Signs it may need replacing: A pedal that slowly sinks under steady foot pressure, a spongy or inconsistent pedal, or visible brake-fluid seepage at the cylinder can indicate a worn master cylinder — diagnose the cause before replacing.

Bleed the brake system and verify proper pedal firmness after installation, and consult the vehicle service information for the correct fasteners and whether they may be reused.

Interchange: 100-3031 · 1003031 · 072-9568 · 0729568 · 13962 · 13-3000 · 133000 · 11-3000 · 113000 · 130.44035 · 131.44035 · MC511570 · 355-76019 · 35576019 · M55233 · NM55233 · MC390753 · 4720106150 · 4720133400 · F140343 · MC140343 · Manufacturer part number M630121.

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

100-3031, 072-9568, 13962, 13-3000, 11-3000, 130.44035, 131.44035, MC511570, 355-76019, M55233, NM55233, MC390753, 4720106150, 4720133400, F140343, MC140343

Frequently Asked Questions

What does the brake master cylinder do?

It converts the force you apply at the brake pedal into hydraulic pressure, sending pressurized brake fluid through the system to actuate the brakes.

What vehicles does the M630121 fit?

It's a direct-fit replacement for the 2002-2003 Lexus ES300 and the 2002-2003 Toyota Camry. Check the Buyer's Guide tab to confirm fitment for your vehicle.

What are signs my master cylinder may need replacing?

A brake pedal that slowly sinks under steady pressure, a spongy or inconsistent pedal, or brake-fluid seepage at the cylinder may point to a worn master cylinder. Diagnose the cause before replacing.

Do I need to bleed the brakes after installing it?

Yes. Bleed the brake system after installation to remove air, then verify a firm, consistent pedal before driving.

Are mounting fasteners included?

Consult the vehicle service information for the correct fasteners and whether they may be reused, as some brake hardware is single-use.

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