Air in brake system

An NHTSA Preliminary Evaluation into Honda vehicles. Closed 19 October 2009.

Investigation
PE09024
Type
Preliminary Evaluation
Opened
13 May 2009
Closed
19 October 2009

What NHTSA investigated

The office of defects investigation (odi) has received 69 complaints, and honda has received 613 complaints and field reports, alleging low/soft/spongy brake pedal travel in model year (my) 2006 through 2008 honda odyssey minivans.twenty-six odi complaints were also reported to honda, resulting in a total complaint count of 656.SOME complaints allege that the condition resulted in extended stopping distances, including some reports of rolling past stop signs or traffic lights.there are 14 alleged crashes in the subject vehicle population related to low/soft pedals. In response to odi's information request for preliminary evaluation PE09-024, honda indicated that small amounts of air may enter the brake system during initial diagnostics of the vehicle stability assist (vsa) modulator while the pump is briefly actuated for system diagnostics after the engine is started.the amount of air gradually increases with each successive engine start cycle, resulting in progressively increasing brake pedal stroke.according to honda, the condition does not present a significant risk to motor vehicle safety because the pedal stroke gradually increases, providing the driver with information that the brake pedal height is changing and requires attention.honda has further indicated that there is no deterioration of braking performance caused by the subject condition, even though the pedal height and feel are different, until pedal stroke has reached the end of travel and the driver cannot produce any additional brake line pressure.honda states that it is unaware of any vehicles that have reached such a condition and honda testing using a leaking field return modulator indicates that it would take over a year before the pedal travel would reach its limit during hard stops with 200 n (45 lbf) of pedal effort - the nominal force required to reach ABS braking mode. Odi's analysis of warranty data indicates that the my 2007-08 odyssey vehicles have experienced the alleged defect at a rate of 0.67%.THE my 2006 odyssey vehicles have experienced the alleged defect at a significantly lower rate (0.04%) than the my 2007-08 odyssey.honda implemented a design change in the my 2007 vehicles to change the vsa diagnostic program. This investigation has been upgraded to an engineering analysis (EA09-014) for the my 2007-08 odyssey vehicles to continue to investigate the scope, frequency, and safety-related consequences of the alleged defect.

The recall that followed

  1. Honda — Service Brakes, Air10V09800016 March 2010412,000 vehicles

Vehicles covered

MakeModelModel years
HondaODYSSEY2006–2008

Source

From NHTSA’s investigation file, rebuilt daily. To report a problem with your own vehicle, go to nhtsa.gov/report-a-safety-problem. All open investigations.