You're about to start a journey in very frosty weather. What's the likely cause of low air-brake pressure?

You're about to start a journey in very frosty weather. What's the likely cause of low air-brake pressure?

Frozen moisture in the storage tanks

Correct answer

DVSA explanation

Air-brake systems use air from the atmosphere, which contains moisture. The moisture condenses under pressure, resulting in water in the system. Make sure the air tanks are drained daily to remove any water and to help prevent the system from freezing in cold weather.

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)

LGV CPC

Module 2 Theory Test

PCV

Theory Test (part 1a and 1b)

PCV CPC

Module 2 Theory Test

Industry leading reviews from 2592 verified buyers...

"Lovely app, passed my theory test my first time, a lot of questions on the app came out in the test. No regrets."

Sehrinah

1 day ago via Apple App Store

"Very helpful app. It truly amazing"

Rhyriene

2 days ago via Apple App Store

"very good site and content, same set up as the exam itself perfect"

PAUL JUSTIN CLARKE

3 days ago via Reviews.co.uk

"good"

Ozioma Maxwell

1 week ago via Reviews.co.uk

"I did well in my mock test"

Temidayo Agboola

1 week ago via Reviews.co.uk

"Brilliant app , very very helpful and easy to use 10/10"

Mikey e n

1 week ago via Apple App Store

"Great"

Hannah Cochrane

1 week ago via Reviews.co.uk

"Verry helpful! The video clips explained in detail. Thank you!"

violeta iacub

1 week ago via Reviews.co.uk

"Good"

Tazeem Akhtar

2 weeks ago via Reviews.co.uk

"GOOD"

Fahid Ali

2 weeks ago via Reviews.co.uk

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


📚 It’s National Online Learning Day! Learning to drive? Get ready for your driving theory test anytime, anywhere with our online driving theory training. 🚗💻 Start learning today: https://t.co/jlI1c9IM4i #cardrivingtheory #drivingtheory #theorytestpractice #booktheorytest
1 day ago
💡 Driving theory test tips 💡 Anti-lock brakes may be ineffective when vehicles have poor contact with the road surface because it could cause one or more of the tyres to lose grip on the road. 🚗 Start practising to pass the DVSA theory test now 👇 https://t.co/E1yXfzKHNk https://t.co/2U6o9ulwes
1 day ago
Getting ready to take your HGV / LGV theory test? 🚛 Take an online mock theory test to see how ready you are 👇 https://t.co/p6jyUN7ItJ #hgvtheorytest #lgvtheorytest #mocktheorytest #theorytest
1 week ago
Where should you avoid overtaking? 🛣️🚗 Answer this DVSA revision theory test question now 👇 https://t.co/xwZ7u1ygb4 #theorytest #practicetheorytest #theorytestpractice #dvsatheorytest https://t.co/KPJoRR3X5p
1 week ago
Preparing for the DVSA motorcycle theory test? 🚦🏍️ Try our FREE motorcycle practice theory test 👇 https://t.co/RG1tofZtz0
1 week ago
🚗 Ready to pass your UK driving theory test? Practise with realistic questions, build your confidence, and get fully prepared for test day with Driving Theory 4 All. Start practising today 👉 https://t.co/jlI1c9IM4i #drivingtheorytest #theorytestpractice #cardrivingtest
2 weeks ago
Want to sample the most up-to-date DVSA practice driving theory test questions and answers before you sit your UK DVSA driving theory test? Get your free theory test practice here 👇 https://t.co/67K9g2c8o5 #theorytestpractice #cartheorytest #theorytest #drivingtest
2 weeks ago
Is your driving theory test coming up soon? 👀 The best way to prepare is by taking practice theory tests, especially if your test date is close. 🎓 We’ve got free practice tests ready for you. Try one now. 👇 https://t.co/pOORgktQtG #theorytestpractice #cartheorytest
2 weeks ago
How long is a theory test valid? 🤷‍♀️🤷‍♂️ Our handy article below will help you understand everything you need to about your driving theory test 👇 https://t.co/A9ix1I8SNf https://t.co/GARLXOi1uG
2 weeks ago
Which colour follows the green signal at a puffin crossing? 🚦🚗 Find out now along with everything you need to know about puffin crossings 👇 https://t.co/HSqCXTdB4b #puffincrossing #theorytest #drivingtheorytest #booktheorytest https://t.co/jFq6xlnNzj
2 weeks ago
🚗 Revising for your theory test? Use our FREE theory test practice resources to test your knowledge and build confidence. 👉 https://t.co/66v9hVuK0d #theorytest #theorytestpractice
2 weeks ago
Looking for theory test revision? 🚗🚛🏍️🚌 Get started with Driving Theory 4 All by taking a free mock theory test 👇 https://t.co/7il2jIpX4r #theorytest #mocktheorytest #theorytestpractice https://t.co/xy4U02578A
2 weeks ago
Looking to take your car driving theory test soon? 👀 Try a free DVSA practice theory test so see how prepared you are 👇 https://t.co/pOORgktQtG #drivingtheorytest #cartheorytest #theorytest #practicetheorytest
3 weeks ago
Want to try some FREE mock theory tests to get ready to pass your DVSA theory test in 2026? 👀 Whether you're taking your car theory test or your ADI Part 1 theory test we've got you covered! 👇 https://t.co/7il2jIpX4r https://t.co/c4Z0Lc6hGa
3 weeks ago
Learning to drive? 🚗 Don’t forget the Highway Code! It’s essential for becoming a safe, confident driver and will help you prepare for your driving theory test and make safer decisions on the road. 👇 https://t.co/cw9v6M6xwS #theorytest #cartheorytest
3 weeks ago
Learning to drive is exciting for everyone, but what age can you start driving in the UK? 🤷‍♂️ This article explains what you need to do and how old you need to be to start driving in the UK 👇 https://t.co/SQM1vN26iB #drivingtheorytest #drivingtheory4all #cartheorytest https://t.co/nlXOgpMjT1
3 weeks ago
Where should you avoid overtaking? 🛣️🚗 Answer this DVSA revision theory test question now 👇 https://t.co/xwZ7u1ygb4 #theorytest #practicetheorytest #theorytestpractice #dvsatheorytest https://t.co/vu5YDFRVDK
3 weeks ago
Getting ready to take your car theory test? 🚗 Make sure you feel confident before the big day with some extra theory test practice 👀 Our free practice theory test is a simple way to test your knowledge, and see which areas you might need to revise 👇 https://t.co/pOORgktQtG
4 weeks ago
Do you know the UK speed limits? 🚗 Single carriageways = 60 mph and dual carriageways and motorways = 70 mph 🛤️ Find out everything you need to know 👇 https://t.co/Dq7Fqfqy2f https://t.co/Iijurndj6G
4 weeks ago
How ready are you for the car theory test? 🚗📝 Take a free 50-question DVSA-style mock theory test, get instant feedback and compare your score with the real pass mark. Try it here 👇 https://t.co/rvl4V1Xkt2 #cartheorytest #mocktheorytest
4 weeks ago

Continue your free practice

Industry leading reviews from 2592 verified buyers...

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

Driving Theory 4 All

Who we help

What we offer

Why learners choose Driving Theory 4 All