You're stationary. The brake air-pressure warning light comes on. Why should you keep the parking brake on?

Book My Theory Test

Not quite, but now you know for next time!

You're stationary. The brake air-pressure warning light comes on. Why should you keep the parking brake on?

Because it will cause the air pressure to rise

You selected this answer

Because the service brake may not stop you

Correct answer

View DVSA explanation

DVSA explanation

Even though a warning device indicates low air-brake pressure, you may still be able to release the parking brake. If you do this and start moving, the service brake may be ineffective and you may not be able to stop.

Want more free practice?

Take a free PCV practice theory test

Ready to test yourself on the latest DVSA revision questions?

Get full PCV theory test practice

Continue your free practice

More free ways to get ready for your DVSA PCV theory test.

Take a free PCV mock theory test Take a free PCV hazard perception test Take a free road signs practice test

Not what you were looking for?

Find out what we offer for every DVSA theory test by selecting the theory test you want to prepare for.

Theory Test (part 1a and 1b)

Module 2 Theory Test

Theory Test (part 1a and 1b)

Module 2 Theory Test

Industry leading reviews from 2672 verified buyers...

"working my way through each topic taking mock tests and receiving helpful constructive feedback. to date money well spent."

Alan Leigh

19 hours ago via Reviews.co.uk

"exellent"

Joel Magistrado Torrente

2 days ago via Reviews.co.uk

"These videos really helped me to understand hazards"

Naqash Mushtaq

3 days ago via Reviews.co.uk

"I am pleased with using the PCV theory test practice so far. Hopefully I pass the test in the coming days."

David Williams

4 days ago via Reviews.co.uk

"This is best theory assistant"

mohamed husseen

1 week ago via Reviews.co.uk

"Very good and has helped me Pass my motorbile theory test . I wish I had this When I did my Car theory test ,"

Matthew English

1 week ago via Google Play Store

"difficult but tells you the hardest question yo get them out the way if come on theory, this saved my test as a question i remember that i went back to change ment the difference from failure and p..."

Luke Cole

1 week ago via Google Play Store

"i just started with website i must say its top top 10 out of 10"

yehuda lieby

1 week ago via Reviews.co.uk

"Very informative 👍"

Salome Kangethe

1 week ago via Reviews.co.uk

"asd"

gershon milgram

1 week ago via Reviews.co.uk

Read More Reviews

Driving Theory 4 All Reviews

Keep up to date with us on social media...


Working towards your PCV theory test? 🚌 Revise with the most up-to-date DVSA practice theory test questions, hazard perception clips and unlimited PCV mock theory tests. Get 60 days' web and app access from £14.99 👇 https://t.co/DueLeoFnsn #PCV #theorytest
1 day ago
Do you recognise the mini-roundabout sign? 🔄🚗 It's a regulatory road sign that could come up in your DVSA theory test. Check its meaning and test your road sign knowledge 👇 https://t.co/TeArtP0VhE #roadsigns #theorytest
1 day ago
Preparing for LGV Driver CPC Module 2? 🚛 Our £14.99 practice package includes 60+ case studies and revision material covering the DVSA topic areas. Get ready for the case studies test 👇 https://t.co/7evNuEXTvE #drivercpc #LGV
1 day ago
Looking for free theory test practice? 📝 Try DVSA practice theory test questions for car, motorcycle, HGV/LGV, PCV or ADI Part 1. No payment or sign-up needed. Choose your practice test 👇 https://t.co/pOORgktQtG #theorytestpractice
2 days ago
Motorcycle theory test coming up? 🏍️ Revise with the latest DVSA motorcycle theory test revision questions, hazard perception practice and unlimited mock theory tests. Packages start at £5.99 for 365 days' access 👇 https://t.co/8lt9yJFTl5 #motorcycletheorytest
2 days ago
What age can you start driving in the UK? 🚗 Most people can start learning to drive a car at 17, but you can apply for a provisional licence from 15 years and 9 months. Find out more about the age rules and exceptions 👇 https://www.drivingtheory4all.co.uk/what-age-can-you-start-driving-in-the-uk #learnerdriver
3 days ago
Ready to book your theory test? 📅🚗 Choose your preferred DVSA test centre, date and time. We'll arrange your booking, subject to availability, with online and app revision included. Get your theory test booking 👇 https://www.drivingtheory4all.co.uk/book-theory-test #booktheorytest
3 days ago
Passed multiple choice but missed the hazard perception mark? 🚗📝 You need to pass both parts of the car theory test. If you fail either one, you'll need to retake the whole test. Check the theory test pass marks 👇 https://www.drivingtheory4all.co.uk/theory-test-pass-mark #theorytest
3 days ago
Can you stop in a yellow box junction? 🚦 Normally, you must not enter unless your exit is clear. But there's an exception when turning right. Make sure you know the yellow box junction rules 👇 https://t.co/RJT5r0lTeR #highwaycode #theorytest
4 days ago
Booked your car theory test? 🚗 Our car theory test practice packages start at £5.99, with DVSA-licensed questions, hazard perception clips and unlimited mock tests. 365 days' web and app access 👇 https://t.co/HP7zW9uBMT #cartheorytest
4 days ago
Want your theory test booking and revision together? 📅🚗 Our £49 car and motorcycle package includes the £23 DVSA test fee, theory test practice and eligible unlimited re-sits. T&Cs apply. See the package 👇 https://t.co/X7zRfxQpRy #booktheorytest
4 days ago
Got a theory test question wrong? 📝 Don't just remember the answer. Read the explanation so you understand why it's right. Try our free theory test questions and answers 👇 https://t.co/67K9g2c8o5 #theorytestpractice
4 days ago
What is a contraflow system? 🚧🛣️ It’s a temporary arrangement where traffic flows differently from normal, often during motorway or dual carriageway roadworks. Learn what to expect 👇 https://t.co/SgC8LD44Ds #theorytest #theorytestpractice
5 days ago
Looking to book a theory test? 📅🚗 Our £49 car and motorcycle package includes your DVSA theory test booking, web and app revision and eligible unlimited re-sits. See what’s included 👇 https://t.co/X7zRfxQpRy #booktheorytest #theorytest
6 days ago
Need hazard perception test practice? 👀🚗 Try a free hazard perception test with instant scoring feedback and choose the test type you’re preparing for. Start practising 👇 https://t.co/WhqbFkSkWa #hazardperception #theorytestpractice
6 days ago
When can you take your theory test? 📅🚗 Most learner drivers can take it from age 17 once they have a valid provisional driving licence. You can start revising before then. Read the guide 👇 https://t.co/uCYuknKBql #theorytest #drivingtheorytest
1 week ago
Ready to check your PCV theory knowledge? 🚌📝 Take a FREE PCV mock theory test, get instant feedback and find out which topics need more revision. Start the test 👇 https://t.co/AxWuuty8Xi #PCV #mocktheorytest
1 week ago
Do you know your reflective studs on a motorway? 🛣️ White studs mark lanes and red studs mark the left edge. What do the other colours mean? Revise motorway studs 👇 https://t.co/HJVVIz7mFy #theorytest #theorytestpractice
1 week ago
How much is a theory test in the UK? 💷 A car or motorcycle DVSA theory test costs £23. Fees are different for HGV and PCV tests. See the current theory test costs 👇 https://t.co/zShHUKpG0b #theorytest #drivingtheorytest #theorytestpractice
1 week ago
Training to become a driving instructor? 🚗📚 Prepare for the ADI Part 1 theory test with practice covering the knowledge you’ll need for the multiple-choice and hazard perception sections. Start revising for the ADI Part 1👇 https://t.co/f6XgdmQFxG #ADI #theorytest
1 week ago