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Saturn L300 Power Brake Boosters

Saturn L300 Power brake boosters

Starting at $104.95, AutoBuffy stocks 1 power brake boosters from SKP to fit the Saturn L300. The brake booster uses engine vacuum to multiply the force you apply to the pedal, making stops easier and safer. When it fails, pedal effort increases dramatically and stopping distances grow — a serious safety risk that warrants immediate attention.

Signs your Saturn L300 needs a new power brake booster

  • Hard, stiff brake pedal that requires significantly more leg pressure than usual to slow the vehicle
  • Pedal feels firm and unresponsive immediately after engine start, before vacuum can build
  • Vehicle takes noticeably longer to stop than normal despite fully pressing the pedal
  • Hissing or sucking sound from behind the dashboard when the brake pedal is pressed or released
  • Engine idle drops, stumbles, or stalls when you press the brake pedal hard
  • Brake pedal sinks slowly to the floor under steady pressure, indicating vacuum loss through a failed diaphragm

Which power brake booster should you buy for your Saturn L300?

The most important decision is whether to buy a direct-fit remanufactured unit or a new aftermarket booster — both restore full vacuum assist, but they differ in cost, core exchange requirements, and warranty coverage. You should also confirm booster diameter and whether your Saturn L300 uses a single- or dual-diaphragm design, since these are not interchangeable.

Remanufactured OE-style booster
Best for
Budget-conscious owners who want a proven design
What you get
Rebuilt original-spec unit; typically requires a core return; lower upfront cost; matched fit and vacuum rating
New aftermarket booster
Best for
Owners wanting a fresh part with no core hassle
What you get
Brand-new diaphragm, housing, and hardware; no core charge; full manufacturer warranty; direct-fit to OE mounting points
Single-diaphragm booster
Best for
Vehicles with lighter braking loads or where OE spec is single-diaphragm
What you get
Compact size, adequate assist for standard braking; only correct if your Saturn L300 originally used this design
Dual-diaphragm booster
Best for
Heavier vehicles or applications needing maximum pedal assist
What you get
Greater vacuum multiplication in a similar-sized housing; reduces pedal effort more than single-diaphragm; must match OE spec for proper fit

Power brake boosters brands we stock for your Saturn L300

SKP
1 option · from $104.95

Replacing the power brake booster on a Saturn L300

Moderate⏱ 1.5–3 hoursCombination wrench set and socketsBrake line wrench (flare-nut wrench) if master cylinder lines must be movedNeedle-nose pliers for retaining clips and cotter pinsFlashlight or work light for confined engine bay accessBrake fluid catch container and shop rags

The booster mounts between the firewall and the master cylinder, secured by nuts accessed from inside the cabin and a pushrod connected to the brake pedal. The master cylinder must be unbolted and moved aside — carefully, to avoid stressing brake lines — before the old booster can be pulled through the firewall. Transfer any brackets or the pushrod clevis to the new unit, reinstall in reverse order, and verify firm pedal feel with the engine running before returning the vehicle to service.

Frequently asked questions

How much does it cost to replace power brake boosters on a Saturn L300?
Parts start at $104.95 on AutoBuffy. A shop will typically add one to two hours of labor on top of the part cost. Total out-of-pocket expense varies by location and whether the master cylinder is replaced at the same time, but budgeting the part cost plus roughly one to two hours of shop labor is a reasonable estimate.
Can I drive my Saturn L300 with a bad brake booster?
You can physically move the vehicle, but it is not safe. A failed booster removes the vacuum assist that multiplies your pedal force, meaning you must push much harder to achieve the same stopping power. In an emergency stop situation, this dramatically increases braking distance and the risk of a collision. Replace the booster promptly.
How do I test whether the brake booster is failing on my Saturn L300?
With the engine off, pump the brake pedal four to five times to exhaust residual vacuum, then hold firm pressure on the pedal and start the engine. If the booster is working, the pedal should drop slightly as vacuum builds. If the pedal stays hard and does not drop, the booster or its vacuum supply is faulty.
Does replacing the brake booster on a Saturn L300 require bleeding the brakes?
Not always, but it depends on whether the master cylinder is disturbed during removal. If you disconnect the master cylinder from the booster and any brake fluid lines are opened, bleeding is required to remove air from the system. If the master cylinder stays attached and no lines are opened, bleeding is generally unnecessary.
How long does a power brake booster last on a Saturn L300?
Brake boosters are designed to last the life of the vehicle and commonly do so under normal conditions. Failure is most often caused by a torn internal diaphragm, a cracked vacuum hose leading to the booster, or contamination from a leaking master cylinder. Inspecting the vacuum hose at every service interval helps catch problems early.
Will a bad brake booster cause my Saturn L300 to fail a safety inspection?
Yes, in most jurisdictions a vehicle with a failed brake booster will not pass a safety or brake inspection. Inspectors test pedal feel and stopping performance; a hard pedal or extended stopping distance is a direct failure point. Some states also visually inspect the booster and vacuum line for obvious damage or leaks.

Shop power brake boosters by year for the Saturn L300

20052004200320022001

More parts for your Saturn L300

Vapor Canister Purge SolenoidEngine Balance Shaft ChainDrum Brake Wheel CylinderA/C CondenserVapor Canister Vent Solenoid HarnessHVAC Pressure TransducerLateral ArmTailgate Lift Support

Power brake boosters for other Saturn models

Saturn LW2Saturn LW300Saturn LSSaturn RelaySaturn L200Saturn LW1