L-SB-0074-09
June 26, 2009
Brake Booster Vacuum Check Valve Rattle/Buzz Noise
| YEAR(S) | MODEL(S) | ADDITIONAL INFORMATION |
|---|---|---|
| 2004 – 2010 | RX330, RX350 |
Introduction
Some RX330/350 vehicles may exhibit a rattle or buzz type noise coming from the driver’s side instrument panel area. The noise can be duplicated when lightly accelerating and then decelerating, or when depressing the brake pedal with the shift lever in Park and then releasing the brake pedal. An improved vacuum check valve is now available to reduce this noise.
Parts Information
| VALVE SHAPE | PREVIOUS PART NUMBER | CURRENT PART NUMBER | PART NAME | QTY |
|---|---|---|---|---|
| Straight Valve | 44730-22150 | 44730-20080 | Vacuum Valve Assembly | 1 |
| 90 Degree Valve | 44730-12070 | 44730-14050 | 1 |
Warranty Information
| OP CODE | DESCRIPTION | TIME | OFP | T1 | T2 |
|---|---|---|---|---|---|
| BR9004 | R & R Brake Booster Vacuum Check Valve | 0.4 | 44730-#2##0 | 91 | 99 |
APPLICABLE WARRANTY
|
Repair Procedure
| NOTE
Replace vacuum check valve with the same type as originally equipped (straight or 90◦). |
- Confirm the noise is coming from the brake booster vacuum check valve.
Figure 1.
| 1 | Vacuum Check Valve |
- Remove the vacuum tube clip from the brake booster check valve.
- Remove and replace the brake booster vacuum check valve.
| NOTE
Make sure NEW valve is fully seated into brake booster grommet and returned to original condition. |
- Reconnect vacuum hose to the brake booster check valve and secure with clip.
- Confirm that there are no vacuum leaks.
- Confirm the noise has been eliminated.
- QUALITY ASSURED
- Reduces: rough idle, engine surge, hesitation, and spark plus fouling
- 20 oz. bottle.
- Improves: cold start performance, and fuel stability for up to one year
Last update on 2026-06-16 / Affiliate links / Images from Amazon Product Advertising API
- DEEP FUEL SYSTEM CLEANING - Cleans the entire fuel system (injectors, carburetor passageways, intake valves, and chamber areas) to help restore power, MPG, and throttle response.
- FUEL ADDITIVE FOR GASOLINE AND DIESEL ENGINES - Breaks down fuel residues and varnish for smoother idling and cleaner combustion in gasoline and diesel engines.
- OIL TREATMENT FOR ENGINE CLEANING - Cleans sludge and deposits that can restrict oil flow and lubrication in motor oil crankcases, helping support longer engine life in car and truck engines.
- FUEL STABILIZER - Keeps gas or diesel fresh for up to 2 years. Ideal as a fuel stabilizer and gas stabilizer for stored cars, motorcycles, and generators.
- SAFE FOR ALL ENGINES & FUELS - Compatible with all gasoline and diesel fuels and blends, including E10 and E85. Trusted for use as a gasoline and diesel fuel additive.
Last update on 2026-06-17 / Affiliate links / Images from Amazon Product Advertising API
- The world’s #1 fuel additive for both gasoline and diesel engines
- A great tune-up in a bottle – treats gasoline, diesel fuel and increases MPG
- Cleans and lubricates the fuel system, including fuel injectors, carburetor and combustion chamber
- Improves fuel economy by burning excess exhaust emissions
- Increases power and acceleration by improving fuel flow and reducing deposit buildup
Last update on 2026-06-17 / Affiliate links / Images from Amazon Product Advertising API
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