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petermct

Mk1 brake servo needed

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Hello,

The brake servo on my 2002 Prius has given up and I'm looking for a second hand replacement,

so if you or someone you know is breaking a series one Prius, please get in touch.

 

Thanks

 

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It's more than likely just the accumulator (Can you here the pump ?), the booster is listed with the pump - 47070-47010 as long as is not a grey import

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There is no "Servo" on a Prius, as Flash says you have a booster (47960A), accumulator (47950D) and a Master Cylinder ( not available individually but serviceable using 04493)

( note 44785C is not re-usable )

Capture.PNG

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My understanding is "booster" is just American English for a brake servo, and it's typical for Toyota to use American names for parts.

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It's not a conventional servo or brake booster as it doesn't get a vacuum from the engine, it is an electric motor that build pressure in an accumulator

It is a booster as it "boosts" the braking effect

To be pedantic - from the CED (widely excepted Americanism)

booster
noun [ C ]
 

booster noun [C] (IMPROVEMENT)

 

something that improves or increases something:
 
from the EPC
187292007_priusbooster.thumb.jpg.2dc2461c09a8369fa9d8f323366d34cc.jpg
 
 

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Only naturally-aspirated petrol engines really have useful manifold vacuum pressure for supplying the servo. It's typical for turbo diesels to have similar electric pump-driven servos (in addition to supply from the manifold) and I typically see those referred to as "servos" by non-Americans (and Haynes manuals, etc.). The electric vacuum pump is normally a separate component, but maybe it's integrated in the Prius - it's not clear to me. But I'm not sure it makes it not a servo, Americans just don't use that word in reference to braking systems and I think that's why it's named as such.

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it's a universally adopted term as i posted above Toyota refer to it as a booster worldwide, booster and servo are interchangeable as are a lot of words in the automotive world

boost (v.)

"to lift or raise by pushing from behind," 1815, literal and figurative, American English, of unknown origin. Related: Boosted; boosting. As a noun, "a lift, a shove up, an upward push," by 1825.

 

 

it's an electrically driven pump on all hybrids

s-l1600.jpg

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